JavaScript - Newbe, How To Convert Php Variable (array) To Use In Js

//create before element
var myNewElement = document.createElement("li");
var newList = document.getElementsByTagName("li")[2];
myNewElement.insertBefore(newList, myNewElement);
myNewElement.innerHTML = "Another List";
//document.getElementsByTagName("li").appendChild();

var MojoZoom = (function() {

	var $ = function(id) {return document.getElementById(id);};
	var dc = function(tag) {return document.createElement(tag);};

	var defaultWidth = 288;
	var defaultHeight = 288;

	function addEvent(element, ev, handler) 
	{
		var doHandler = function(e) {
			return handler(e||window.event);
		}
		if (element.addEventListener) { 
			element.addEventListener(ev, doHandler, false); 
		} else if (element.attachEvent) { 
			element.attachEvent("on" + ev, doHandler); 
		}
	}

	function getElementPos(element)
	{
		var x = element.offsetLeft;
		var y = element.offsetTop;
		var parent = element.offsetParent;
		while (parent) {
			x += parent.offsetLeft;
			y += parent.offsetTop;
			parent = parent.offsetParent;
		}
		return {
			x : x,
			y : y
		}
	}

	function getEventMousePos(element, e) {
		var scrollX = document.body.scrollLeft || document.documentElement.scrollLeft;
		var scrollY = document.body.scrollTop || document.documentElement.scrollTop;

		if (e.currentTarget) {
			var pos = getElementPos(element);
			return {
				x : e.clientX - pos.x + scrollX,
				y : e.clientY - pos.y + scrollY
			}
		}
		return {
			x : e.offsetX,
			y : e.offsetY
		}
	}

	function makeZoomable(img, zoomSrc, zoomImgCtr, zoomWidth, zoomHeight, alwaysShow) {
		// make sure the image is loaded, if not then add an onload event and return
		if (!img.complete && !img.__mojoZoomQueued) {
			addEvent(img, "load", function() {
				img.__mojoZoomQueued = true;
				setTimeout(function() {
				makeZoomable(img, zoomSrc, zoomImgCtr, zoomWidth, zoomHeight, alwaysShow);
				}, 1);
			});
			return;
		}

		// sorry
		var isIE = !!document.all && !!window.attachEvent && !window.opera;

		var w = img.offsetWidth;
		var h = img.offsetHeight;

		var oldParent = img.parentNode;
		if (oldParent.nodeName != "A") {
			var linkParent = dc("a");
			linkParent.setAttribute("href", zoomSrc);
			oldParent.replaceChild(linkParent, img);
			linkParent.appendChild(img);
		} else {
			var linkParent = oldParent;
		}

		linkParent.style.position = "relative";
		linkParent.style.display = "block";
		linkParent.style.width = w+"px";
		linkParent.style.height = h+"px";

		var imgLeft = img.offsetLeft;
		var imgTop = img.offsetTop;

		var zoom = dc("div");
		zoom.className = "mojozoom_marker";

		var zoomImg = dc("img");
		zoomImg.className = "mojozoom_img";

		zoomImg.style.position = "absolute";
		zoomImg.style.left = "-9999px";
		document.body.appendChild(zoomImg);

		var parent = img.parentNode;

		var ctr = dc("div");
		with (ctr.style) {
			position = "absolute";
			left = imgLeft+"px";
			top = imgTop+"px";
			width = w+"px";
			height = h+"px";
			overflow = "hidden";
			display = "none";
		}

		ctr.appendChild(zoom);
		parent.appendChild(ctr);

		var zoomInput = parent;

		var useDefaultCtr = false;
		if (!zoomImgCtr) {
			zoomImgCtr = dc("div");
			zoomImgCtr.className = "mojozoom_imgctr";

			var imgPos = getElementPos(img);
			zoomImgCtr.style.left = w + imgPos.x + "px";
			zoomImgCtr.style.top = imgPos.y + "px";

			zoomImgCtr.style.width = (zoomWidth ? zoomWidth : defaultWidth) +"px";
			zoomImgCtr.style.height = (zoomHeight ? zoomHeight : defaultHeight) +"px";

			document.body.appendChild(zoomImgCtr);

			useDefaultCtr = true;
		}

		zoomImgCtr.style.overflow = "hidden";

		if (!alwaysShow) {
			zoomImgCtr.style.visibility = "hidden";
		}

		addEvent(zoomImg, "load", function() {
			var zoomWidth = zoomImg.offsetWidth;
			var zoomHeight = zoomImg.offsetHeight;

			var ctrWidth = zoomImgCtr.offsetWidth;
			var ctrHeight = zoomImgCtr.offsetHeight;

			var ratioW = zoomWidth / w;
			var ratioH = zoomHeight / h;

			var markerWidth = Math.round(ctrWidth / ratioW);
			var markerHeight = Math.round(ctrHeight / ratioH);

			document.body.removeChild(zoomImg);
			zoomImgCtr.appendChild(zoomImg);

			var zoomFill = dc("div");
			zoomFill.className = "mojozoom_fill";
			zoom.appendChild(zoomFill);

			var zoomBorder = dc("div");
			zoomBorder.className = "mojozoom_border";
			zoom.appendChild(zoomBorder);

			zoom.style.width = markerWidth+"px";
			zoom.style.height = markerHeight+"px";


			if (alwaysShow) {
				zoom.style.left = "0px";
				zoom.style.top = "0px";
	
				zoomImg.style.left = "0px";
				zoomImg.style.top = "0px";
			}

			var isInImage = false;

			if (!alwaysShow) {
				addEvent(zoomInput, "mouseout", 
					function(e) {
						var target = e.target || e.srcElement;
						if (!target) return;
						if (target.nodeName != "DIV") return;
						var relTarget = e.relatedTarget || e.toElement;
						if (!relTarget) return;
						while (relTarget != target && relTarget.nodeName != "BODY" && relTarget.parentNode) {
							relTarget = relTarget.parentNode;
						}
						if (relTarget != target) {
							isInImage = false;
							ctr.style.display = "none";
							zoomImgCtr.style.visibility = "hidden";
						}
					}
				);
				// a bit of a hack, mouseout is sometimes not caught if moving mouse really fast
				addEvent(document.body, "mouseover", 
					function(e) {
						if (isInImage && !(e.toElement == zoomBorder || e.target == zoomBorder)) {
							ctr.style.display = "none";
							zoomImgCtr.style.visibility = "hidden";
							isInImage = false;
						}
					}
				);
			}

			addEvent(zoomInput, "mousemove", 
				function(e) {
					isInImage = true;

					var imgPos = getElementPos(img);

					if (useDefaultCtr) {
						zoomImgCtr.style.left = w + imgPos.x + "px";
						zoomImgCtr.style.top = imgPos.y + "px";
					}
					ctr.style.display = "block";
					zoomImgCtr.style.visibility = "visible";

					var pos = getEventMousePos(zoomInput, e);
					if (e.srcElement && isIE) {
						if (e.srcElement == zoom) return;
						if (e.srcElement != zoomInput) {
							var zoomImgPos = getElementPos(e.srcElement);
							pos.x -= (imgPos.x - zoomImgPos.x);
							pos.y -= (imgPos.y - zoomImgPos.y);
						}
					}
					var x = markerWidth/2;
					var y = markerHeight/2;

					if (!isIE) {
						pos.x -= imgLeft;
						pos.y -= imgTop;
					}

					if (pos.x < x) pos.x = x;
					if (pos.x > w-x) pos.x = w-x;
					if (pos.y < y) pos.y = y;
					if (pos.y > h-y) pos.y = h-y;

					var left = ((pos.x - x)|0);
					var top = ((pos.y - y)|0);

					zoom.style.left = left + "px";
					zoom.style.top = top + "px";

					zoomImg.style.left = -((pos.x*ratioW - ctrWidth/2)|0)+"px";
					zoomImg.style.top = -((pos.y*ratioH - ctrHeight/2)|0)+"px";
				}
			);
		});

		// I've no idea. Simply setting the src will make IE screw it self into a 100% CPU fest. In a timeout, it's ok.
		setTimeout(function() { 
			zoomImg.src = zoomSrc;
		}, 1);
	}

	function init() {
		var images = document.getElementsByTagName("img");
		for (var i=0;i<images.length;i++) {
			var img = images[i];
			var zoomSrc = img.getAttribute("data-zoomsrc");
			if (zoomSrc) {
				makeZoomable(img, zoomSrc, document.getElementById(img.getAttribute("id") + "_zoom"), null, null, img.getAttribute("data-zoomalwaysshow")=="true");
			}
		}
	}

	return {
		addEvent : addEvent,
		init : init,
		makeZoomable : makeZoomable
	};

})();


MojoZoom.addEvent(window, "load", MojoZoom.init);

<script type="text/javascript">
Arr=['a','b','c'];
Arr2=Arr;
Arr[1]='_';
alert('Array 1: '+Arr);
alert('Array 2: '+Arr2);
// Both arrays become 'a','_','c'
</script>

<?php
//php which sets users array to the results of the sql
$selectquery = "SELECT Username FROM User";
$selectresult = mysql_query($selectquery);
while ($row = mysql_fetch_array($selectresult)){
	$users[] = $row['Username'];

}
?>



<script language="javascript" type="text/javascript">
function verifyUsername(array_var){

	var user = document.getElementById("username").value;
	
	for(var i=0; i<array_var.length; i++){
		if(array_var[i] == user){
			document.getElementById("usernameerror").textContent = "already in array";
		}
	}
}
</script>



//html code for the form
Username: <input type="text" name="username" id="username" onblur="return verifyUsername(<?php $users?>)"/>
        
<span id="usernameerror" class="red"></span>

$(document).ready(function() {
	
var color1=new Array(); 
color1[0]="images/cp-roof-blue.png";       
color1[1]="images/cp-panel-blue.png";
color1[2]="images/cp-trim-blue.png";


function perform(name, x) {
	alert(name[x]);
	//alert([name][x]);
	//alert(name+'['+x+']');
	//alert(color1[0]); // correct
    return name[x];
}
	
function Roof(color) {
	$("#colorPicker .roof").css("background", "url("+color+")");
}
	
$('.btnRoof').click(function() {
	var pid = $(this).parent().parent().attr("id");			
	Roof(perform(pid, 0));
});


});

<!DOCTYPE html>
 <html>
 <head>
 </head>
 <body>
 <input onkeyup="solve(this.value)" /><br>
 <input id="box0" /><br>
 <input id="box1" /><br>
 <input id="box2" /><br>
 <script type="text/javascript">

var equations=["(x*9/5)+32","x+273.15","x-50*(8/13)"]
 
function solve(val){
for (var i = 0; i < equations.length; i++) {
document.getElementById("box"+i).value= //ummm...

	}
} 

</script>
 </body>
 </html>

<script language="JavaScript">
var camArray = new Array();
camArray['Dolliver'] = "http://video.dot.ca.gov/asx/D5-Bello-at-101.asx";
camArray['Mattie'] = "http://video.dot.ca.gov/asx/D5-Mattie-Rd-at-101.asx";
camera="Dolliver";

var camHTMLd = "<object id='MediaPlayer' width=320 height=240 classid='CLSID:22D6f312-B0F6-11D0-94AB-0080C74C7E95' standby='Loading Windows Media Player components...' type='application/x-oleobject' codebase='http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=6,4,7,1112'><param name='filename' value='"+camArray[camera]+"'><param name='Showcontrols' value='False'><param name='autoStart' value='True'><embed type='application/x-mplayer2' src='"+camArray[camera]+"' width=320 height=240></embed></object>"

function changeCam(camera){

	document.getElementById("caltransCamera").innerHTML = camHTMLd;
	//alert(camHTMLd+camArray[camera]);
}

</script>

function WriteContactFormStatement1 () { 
var ContactFormValue = ref2; 
document.write('<input type="hidden" name="UReferrersName" value="' + ContactFormValue + '" />'); 
} 
var WriteContactFormStatement = WriteContactFormStatement1 ();

<!-- START -- Javascript to print the statement for UReferrersName -->
<script language="JavaScript" type="text/JavaScript">
//WriteContactFormStatement();
document.write (WriteContactFormStatement); 
</script>
<!-- End -- Javascript to print the statement for UReferrersName -->

<?php
setcookie("KNwidget", "fbfans", time()+3600);
?>

<?php
if (isset($_COOKIE["KNwidget"]))
  echo "when has COOKIE, nothing show here..";
else
  echo "<script type='text/javascript'>some java script here</script>";
?>