function isIE()
{
	return( window.navigator.userAgent.indexOf("MSIE") != -1 );
}

function isNetscape6()
{
	return( window.navigator.userAgent.indexOf("Netscape6") != -1 );
}

if ( isIE() )
{
	document.onkeypress = IEhandler; 
}
else if ( isNetscape6() )
{
	document.addEventListener("keypress", NS6Handler, true);
}

function IEhandler() 
{		
	if ( (window.event.keyCode == 13) && (window.event.srcElement.tagName == 'INPUT') )
	{	
		
		var okToSubmit = false;
		var element = document.getElementById(window.event.srcElement.PostingControlID);
		
		if(element!=null)
		{
		
			if(element.type=='image')
			{
				document.getElementById('PostingFacade1').name=element.name+".x";
				document.getElementById('PostingFacade1').value=1;

				document.getElementById('PostingFacade2').name=element.name+".y";
				document.getElementById('PostingFacade2').value=1;
				okToSubmit = true;
			}

			if(element.type=='button')
			{
				document.getElementById('PostingFacade1').name=element.name;
				document.getElementById('PostingFacade1').value=element.value;
				okToSubmit = true;
			}

			if(element.type=='submit')
			{
				document.getElementById('PostingFacade1').name=element.name;
				document.getElementById('PostingFacade1').value=element.value;
				okToSubmit = true;
			}

			window.event.keyCode = 0;
			
			if(okToSubmit)
			{
				document.forms(0).submit();
				document.getElementById('PostingFacade1').name="PostingFacade1";
				document.getElementById('PostingFacade1').value="";

				document.getElementById('PostingFacade2').name="PostingFacade2";
				document.getElementById('PostingFacade2').value="";
			}
		}
		else
		{
			window.event.keyCode = 0;
		}
	}	
}	

function NS6Handler(e)
{		
	if ( (e.which == 13) && (e.originalTarget.tagName == 'INPUT') )	
	{	
		e.cancelBubble = true;
	}			
}

<!-- Begin preload -->
var RedImageOn;
var RedImageOff;
var OrangeImageOn;
var OrangeImageOff;
var PurpleImageOn;
var PurpleImageOff;
var AboutOn;
var AboutOff;
var RequestOn;
var RequestOff;
var HelpOn;
var HelpOff;

function Preload(applicationPath)
{
	RedImageOn = new Image();
	RedImageOn.src = applicationPath + "/images/header_redimage_on.gif";
	RedImageOff = new Image();
	RedImageOff.src = applicationPath + "/images/header_redimage_off.gif";
	
	OrangeImageOn = new Image();
	OrangeImageOn.src = applicationPath + "/images/header_orangeimage_on.gif";
	OrangeImageOff = new Image();
	OrangeImageOff.src = applicationPath + "/images/header_orangeimage_off.gif";
	
	PurpleImageOn = new Image();
	PurpleImageOn.src = applicationPath + "/images/header_purpleimage_on.gif";
	PurpleImageOff = new Image();
	PurpleImageOff.src = applicationPath + "/images/header_purpleimage_off.gif";
	
	AboutOn = new Image();
	AboutOn.src = applicationPath + "/images/aboutus_x.gif";
	AboutOff = new Image();
	AboutOff.src = applicationPath + "/images/aboutus_o.gif";
	
	RequestOn = new Image();
	RequestOn.src = applicationPath + "/images/request_x.gif";
	RequestOff = new Image();
	RequestOff.src = applicationPath + "/images/request_o.gif";
	
	HelpOn = new Image();
	HelpOn.src = applicationPath + "/images/help_x.gif";
	HelpOff = new Image();
	HelpOff.src = applicationPath + "/images/help_o.gif";		
}
<!-- End Preload -->

function lite(imgName, theImg)
{
	if(document.images)
	{
		document[imgName].src = theImg.src;
	}
}

function PopupWindow(URL, width, height)
{
	var page;
	var popup;
	var windowprops = 'width='+width + ',height=' + height +',toolbar=no,titlebar=no,scrollbars=no,resizable=no,location=no,status=no,menubar=no'; 
	windowprops += ',top=' + parseInt((screen.availHeight/2)-(350/2)) + ',';
	windowprops += 'left=' + parseInt((screen.availWidth/2)-(350/2));
	popup = window.open(URL,page,windowprops); 
}