function openWindow( myUrl, windowName, xSize, ySize) {
	winLeft=screen.width/2 - xSize/2;
	winTop= screen.height/2 - ySize/2;
	var newWindow = window.open(myUrl,windowName,'width=' + xSize + ',height=' + ySize +' ,top=' + winTop + ',left=' + winLeft +',resizable=no');
	//if (window.focus()) newWindow.focus();
}