/*
 Opens a new 'popup' type window and centers it.
 Uses objects screen.awailWidth and screen.availHeight, window.open and windowobject.focus().
 syntax: <a href="http://www.google.com/" onclick="return goPop(an relative or absolute url eg. this.href,'myPopWin',400,400);">Google in 400px*400px</a>
*/
function ZEV_openWindowCentered(winUrl,winName,winW,winH) {
	var winX = (screen.availWidth - winW) / 2;
	var winY = (screen.availHeight - winH) / 2;
	
	var newWin = window.open(winUrl,winName,'top='+winY+',left='+winX+',width='+winW+',height='+winH+',toolbar=0,status=0');
	//alert('newWin='+newWin+' winUrl='+winUrl+' winName='+winName+' winW='+winW+' winH='+winH+' winX='+winX+' winY='+winY);

	if (newWin) {
		newWin.focus();
		return false;
	} else {
		return true;
	}
}