JavaScript - How Do I Make An Enable Function Out Of This Working Disable Function ??

<script type = "text/javascript">
function enableTextbox() {
if (document.getElementById("dropdown").value == "New") {
document.getElementById("txt1").disabled = false;
}
else {
document.getElementById("txt1").disabled = true;
}
}
</script>

<form action="adm_subtitle.php" method="post">

Static or Random?
<select name="staticrand" id"staticrand" onchange="enableTextbox()">
<option value="static">Static</option>
<option value="rand selected="selected">Random</option>
</select>

Static ID
<input type="text" value="0" name="staticid" id="staticid" maxlength="3" disabled="true" />

<input type="submit" name="submitsubtitleset" value="Submit" />
</form>

<asp:button runat="server" id="btnChangeCommentsAuth" CSSclass="RaiseButton" OnClientClick="CommentsCheck('MainDisplayContentChange_txtAuthCommentsArea');" PostBackUrl="~/RaiseTaskChange.aspx" Text="Auth" />

function CommentsCheck(comments) 
{
    var com;
    var result = new boolean();
    com = document.getElementById(comments);
    if (document.getElementById(comments).value == '') {
        com.style.backgroundColor = "#B20635";
        result = 0;
    }
    else 
    {
    result = 1
    }
}

<SCRIPT LANGUAGE="JavaScript" TYPE="text/JavaScript">
 
function formControl(submitted) 
{
   if(submitted=="1") 
    {
   commentForm.Submit.disabled=true
   alert("Thanks for your comments!")
    }
}
 
</SCRIPT>

<td><input type="text" size="10" name="pris" disabled="disabled"></td>
		<td><input type="text" size="10" name="toppfart" disabled="disabled"></td>
		<td><input type="text" size="10" name="motorinstallasjon" disabled="disabled"></td>
		
		<td><input type="checkbox" name="motorCheckbox" value="<%=motor.getId()%>" 
			onclick="(pris.disabled=!this.checked)&
			(toppfart.disabled=!this.checked)&
			(motorinstallasjon.disabled=!this.checked)">
		</td>

//Next Page Function
	$('.next').click(function() {
		if (current_page == no_pages){
			//do nothing
		}
		else{

			if (flag==false)
			{
				try {
					checkAnswer(document.getElementById('quizForm'))
					flag=true;
					return false;
				}
				catch(err)
				{
					if (err.number !=-2146823281)
					{
						alert(err.description);
					}
				}
			}
			next_page = (current_page + 1);
			$("#content").fadeOut("slow",function(){
				$("#content").load("pages/page_" + next_page + ".html").fadeIn('slow')}		  
			);
			current_page ++;
			$("#current_page").html(current_page);
			progress_bar();
		}
	
	});

//Next Page Function
	$('.next').click(function() {
		if (current_page == no_pages){
			//do nothing
		}
		else{
			next_page = (parseInt (current_page) + 1);
			$("#content").fadeOut("slow",function(){
				$("#content").load("pages/page_" + next_page + ".html").fadeIn('slow')}		  
			);
			current_page ++;
			$("#current_page").html(current_page);
			progress_bar();
		}
	
	});

else{    

                        

        if (document.getElementById('quizForm')){

 

            if (document.quizForm.cc.disabled==true)

                      document.quizForm.cc.disabled=false

 

else

 

{return true;}

<form name="myform4" id="list_apps" method="post">
<?php
for ($i=0; $i<$num_rows;$i++)
{
  ?>
  <p>
  <input type="checkbox" name="app[]" id="app[]" onclick="enable_perm()">
  <input name="set_perm[]" type="submit" id="set_perm[]" value="Set Permissions">  
  </p>      
  <?php
}
</form>

function enable_perm()
{
  document.myform4.set_perm[0].disabled = true;
}

SCRIPT CODE: 

<script type="text/javascript" >
function validateForm()
{

var amount=document.forms["expenserecord"]["amount"].value;
var picker=document.forms["expenserecord"]["picker"].value;
var desc=document.forms["expenserecord"]["description"].value;

if (amount==null || amount=="" || picker==null || picker=="" || desc==null || desc=="") {
  alert("All required fields must be filled out.");
  document.getElementById("sub").disabled = false;
  return false;
}
 
else {
 	document.getElementByID("sub").disabled = true;	
}

}

</script>

BUTTON CODE:

<p><input type="submit" value="Submit" onClick="return validateForm()" id="sub"></p>

<body>
<div name="example1" onload="javascript:retrieve('getstring1')">my retieved string1</div>

<div name="example2" onload="javascript:retrieve('getstring2')">my retieved string2</div>

</body>


<head>
<SCRIPT language="JavaScript">
function retieve('var') {

}
</SCRIPT>



</head>

function() {
var something = 'hello';
}

function(something) {
document.write(something);
}

Event.add(window, 'load', function() 
{
	Event.add('addressSearch', 'click', function() 
	{
		ClickGeocode();
		var el = document.createElement('p');
		el.innerHTML = "  " + addressSearchAddress + " : [" + addressSearchRadius + "]";
		Dom.add(el, 'AddressesVisited');
		Event.add(el, 'click', function(e) 
								{
									Dom.remove(this);
				});
	});
});