function openNewWindow(url,target,width,height){
	posx = (screen.width) ? (screen.width - width)/2 : 0;
	posy = (screen.height) ? (screen.height - height)/2 : 0;
	
	options = "width="+width+",height="+height+",top="+posy+",left="+posx+",menubar=no,toolbar=no,status=no,location=no,scrollbars=yes,resizable=yes";
	newWindow = window.open(url,target,options);

	if(newWindow) 
		newWindow.focus(); 

	return false;
}