var isNav4, isIE4
if (parseInt(navigator.appVersion.charAt(0)) >= 4) {
  isNav4 = (navigator.appName == "Netscape") ? true : false
  isIE4 = (navigator.appName.indexOf("Microsoft" != -1)) ? true : false
}

function winopen(link,width,height) {
   wopts  = 'width='+width+',height='+height+',resizable=0,alwaysRaised=1,scrollbars=1,location=0,toolbar=0,status=0';
   if (isNav4){
   wopts+=',screenX='+((screen.width-width)/2)+',screenY='+((screen.height-height)/2);
   }else wopts+=',left='+((screen.width-width)/2)+',top='+((screen.height-height)/2);
   window.open(link, 'mgsm_popup', wopts);
}
function winopen2(link,width,height) {
   wopts  = 'width='+width+',height='+height+',resizable=1,alwaysRaised=1,scrollbars=1,location=1,toolbar=1,status=1';
   if (isNav4){
   wopts+=',screenX='+((screen.width-width)/2)+',screenY='+((screen.height-height)/2);
   }else wopts+=',left='+((screen.width-width)/2)+',top='+((screen.height-height)/2);
   window.open(link, 'mgsm_popup', wopts);
}