function viewURL(url,width,height,scroll){if(url=='')return false;if(width==null)width=640;if(height==null)height=480;if(scroll==null)scroll=0;win=window.open(url,'','width='+width+', height='+height+', toolbar=0, statusbar=0, location=0, scrollbars='+scroll+', resizable=0');win.moveTo((screen.width-width)/2,(screen.height-height)/2);}