function wopen(url,name,width,height,k)
    {
     if (typeof(newWin) == "object"){newWin.close();};
     LeftPosition = (screen.width) ? (screen.width-width)/2 : 0;
     TopPosition  = (screen.availHeight) ? (screen.availHeight-height)/2 : 0 ;
     newWin = window.open(url,name,'top='+ TopPosition+',left='+ LeftPosition+ ',width='+width+',height='+height+',resizable=0,scrollbars='+k+',status=0');
    }