function openWindow(myUrl, myWidth, myHeight) {
	
	if(myWidth == null){ myWidth = 500; }
	if(myHeight == null){ myHeight = 600; }
	
	var toolbar     = 0;
	var location    = 0;
	var directories = 0;
	var status      = 0;
	var menubar     = 0;
	var scrollbars  = 1;
	var resizable   = 1;
	var top         = 100;
	var left        = 100;
	
	var myWinName = "myPopup";
	var param = "width=" + myWidth + ",height=" + myHeight + ",toolbar=" + toolbar + ",location=" + location + ",directories=" + directories + ",status=" + status + ",menubar=" + menubar + ",scrollbars=" + scrollbars + ",resizable=" + resizable + ",top=" + top + ",left=" + left;
	
	var popUp = window.open(myUrl, myWinName, param);
	popUp.focus();

}