I am trying to learn object oriented javascript and I ran into a problem, which I can't understand. To keep it simple I created a dummy object and then placed everything into one html file, which is below:

HTML Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Object Test</title>

<script type="text/javascript">

function ObjectTest()
	var height ;
	this.setHeight(250) ;
	this.setHeight = function(aHeight)
		height = aHeight ;
		alert(height) ;



<script type="text/javascript">
	var myObj = new ObjectTest() ;
	//myObj.setHeight(250) ;

If you try to run this html file, it will create an object of ObjectTest. In the constructor,
Code JavaScript:
this.setHeight(250) ;
line is giving the actual error. I get an error that says this.setHeight is not a function.

But if you comment that line and uncomment
Code JavaScript:
myObj.setHeight(250) ;
inside the body tag, then, everything works fine.

My question is how do I call previleged methods such as setHeight() from the constructor of the javascript object.

Thank you so much in advance for your help.