function popImage(imgURL,winName, win_width, win_height)
{
	var PosX = (screen.width-win_width)/2; 
	var PosY = (screen.Height-win_height)/2;	
	var newWindow = window.open(imgURL,'',
		'height='+win_height+',width='+win_width+',left='+PosX+',top='+PosY+',scrollbars=yes,'+
		'resizable=yes,location=no,toolbar=no,menubar=no,status=no');
	
	newWindow.focus(); 

}