var popLab = null;

 function openPopLab(urlpage){
   var winFeatures = "width=450,height=465,scrollbars,resizable,status";
   if(popLab != null) if(!popLab.closed){
     return;
     }
   popLab = window.open(urlpage, "ourLab", winFeatures);
   }
 function openPopLabSized(urlpage,width,height){
   var winFeatures = "width="+width+",height="+height+",scrollbars,resizable,status";
   if(popLab != null) if(!popLab.closed){
     return;
     }
   popLab = window.open(urlpage, "ourLab", winFeatures);
   }