function PopUp(win_name,URL,width,height,scrollbars,menubar){

if (scrollbars==null){
   scrollbars=0;
}

if (menubar==null){
   menubar="no"
}

    open( URL,win_name, "width="+width+",height="+height+",status=0,toolbar=0,menubar="+menubar+",resizable=no,location=0,scrollbars="+scrollbars+"");
}



function doclick() {
history.back();
}