function memoriserOrigine(){   
	   l=trouveCookie("origineMetho")
           d=new Date();
	   if (l!=null){
                d.setTime(d.getTime()-1)
                document.cookie= "origineMetho="+l+"; expires=" + d.toGMTString()
//alert("efface "+l)
   	      }           
           // d.setYear(2020)
           document.cookie= "origineMetho="+top.location+"; expires=" + d.toGMTString()
//alert("ecrit "+top.location)

//alert("nouveau cookie:" +document.cookie)
            return true
         }

        function trouveCookie(name){
	   l=null;
	   cs=document.cookie
	   var i=0;
	   while (i<=cs.length){
	        start=i
	        end = start+name.length;  
	         if (cs.substring(start, end)==name) {
	               start=end+1
	               end=cs.indexOf(";", start);
	               if (end<start) end=cs.length
	               l=cs.substring(start, end)
	               break; 
	               }
	       i++
               }

//alert("Trouve cookie:" +document.cookie)

	   return l;
	   }