function launchCenter(url, name, width, height, winstyle) 
	{
		var str = "height=" + height + ",innerHeight=" + height;
		str += ",width=" + width + ",innerWidth=" + width;  if (window.screen) {
		var ah = screen.availHeight - 30;    var aw = screen.availWidth - 10;
		var xc = (aw - width) / 2;    var yc = (ah - height) / 2;
		str += ",left=" + xc + ",screenX=" + xc;
		str += ",top=" + yc + ",screenY=" + yc;  }
		return window.open(url, name, str + "," + winstyle);
	}
	function PopWindow(strURL, width, height)
	{		
		//alert("fawaz");
		launchCenter(strURL, '_blank', width, height, 'scrollbars=yes,toolbar=no,location=no,menubar=no,resizable=no')
	}
	function launchFullScreen( aURL )
	{
	   var wOpen;
	   var sOptions;

	   sOptions = 'status=yes,menubar=yes,scrollbars=yes,resizable=no,toolbar=yes';
	   sOptions = sOptions + ',width=' + (screen.availWidth - 10).toString();
	   sOptions = sOptions + ',height=' + (screen.availHeight - 122).toString();
	   sOptions = sOptions + ',screenX=0,screenY=0,left=0,top=0';

	   wOpen = window.open( '', '_blank', sOptions );
	   wOpen.location = aURL;
	   wOpen.focus();
	   wOpen.moveTo( 0, 0 );
	   wOpen.resizeTo( screen.availWidth, screen.availHeight );
	   return wOpen;
	}
	
	// constants to define the title of the alert and button text.
var ALERT_TITLE = "Validation Failed!";
var ALERT_BUTTON_TEXT = "Ok";

// over-ride the alert method only if this a newer browser.
// Older browser will see standard alerts
if(document.getElementById) {
	window.alert = function(txt) {
		createCustomAlert(txt);
	}
}

function createCustomAlert(txt) {
	// shortcut reference to the document object
	d = document;

	// if the modalContainer object already exists in the DOM, bail out.
	if(d.getElementById("modalContainer")) return;
	// create the modalContainer div as a child of the BODY element
	mObj = d.getElementsByTagName("body")[0].appendChild(document.createElement("div"));
	mObj.id = "modalContainer";
		
	 // make sure its as tall as it needs to be to overlay all the content on the page
	mObj.style.height = document.documentElement.scrollHeight + "px";
	
	// create the DIV that will be the alert 
	alertObj = mObj.appendChild(d.createElement("div"));
	alertObj.id = "alertBox";
	// MSIE doesnt treat position:fixed correctly, so this compensates for positioning the alert
	//if(d.all && !window.opera) 
	//alertObj.style.top = document.documentElement.scrollTop + "px";
	alertObj.style.top = "200px";

	// center the alert box
	alertObj.style.left = (d.documentElement.scrollWidth - alertObj.offsetWidth)/2 + "px";

	// create an H1 element as the title bar
	h1 = alertObj.appendChild(d.createElement("h1"));
	h1.appendChild(d.createTextNode(ALERT_TITLE));

	// create a paragraph element to contain the txt argument
	msg = alertObj.appendChild(d.createElement("p"));
	msg.appendChild(d.createTextNode(txt));

	// create an anchor element to use as the confirmation button.
	btn = alertObj.appendChild(d.createElement("a"));
	btn.id = "closeBtn";
	btn.appendChild(d.createTextNode(ALERT_BUTTON_TEXT));
	btn.href = "#";
	// set up the onclick event to remove the alert when the anchor is clicked
	btn.onclick = function() { removeCustomAlert();return false; }

	
}

// removes the custom alert from the DOM
function removeCustomAlert() {
	document.getElementsByTagName("body")[0].removeChild(document.getElementById("modalContainer"));
}