function popRocks(theURL,windowName,theWidth,theHeight){
	goMiddle = (screen.availHeight / 2) - (theHeight / 2);
	goCenter = (screen.availWidth / 2) - (theWidth / 2);
	window.open(theURL,windowName,"toolbar=0,menubar=no,location=0,scrollbars=yes,resizable=no,width="+theWidth+",height="+theHeight+",left="+goCenter+",top="+goMiddle);
}