function popitup(url,name,windowWidth,windowHeight){    
	myleft=(screen.width)?(screen.width-windowWidth)/2:100;	
	mytop=(screen.height)?(screen.height-windowHeight)/2:100;	
	properties = "width="+windowWidth+",height="+windowHeight;
	properties +=",scrollbars=yes, top="+mytop+",left="+myleft;   
	newwindow=window.open(url,name,properties);
if (window.focus) {newwindow.focus()}
	return false;
}