function setlanguage(str){
   var ls = location.search;
   //alert(ls);
    //if(ls==''){ls='?cat='};
   var index=ls.indexOf("lang");
   var index2=ls.indexOf("_nl");
   var index3=ls.indexOf("_fr");
   
   //alert(index2);
      if (index==-1){
	                     //er zit geen lang= in de url voor het onderdeel partners
						 if (index2==-1){
						 //er zit geen _nl in de url			 
						        if (index3==-1){
									 //er zit geen _fr in de url voor het onderdeel partners
									 if (str=='nl'){
									   location.search=ls+"&lang=nl";					
									 }else{
									   location.search=ls+"&lang=fr";					
									 }
								 }else{
									 location.search=ls.replace("_fr","_nl")+"&lang=nl";	 
								 }
						 }else{				 
						 location.search=ls.replace("_nl","_fr")
						 }
				
		}else{
                 if(str=='nl'){ 
				   if (index3==-1){
				    location.search=ls.replace("=fr","=nl");
					}else{
					ls=ls.replace("fr","nl");
					location.search=ls.replace("fr","nl");
					}
					
				 }else{
				    if (index2==-1){
				    location.search=ls.replace("=nl","=fr");
					}else{
					ls=ls.replace("nl","fr");
					location.search=ls.replace("nl","fr");
					}
				    
				 }
        }
 }
 /*
 function setlanguage(str){
   var ls = location.search;
   //alert(ls);
    //if(ls==''){ls='?cat='};
   var index=ls.indexOf("lang");
      if (index==-1){
	             if (str=='nl'){
				   location.search=ls+"&lang=nl";					
			     }else{
				   location.search=ls+"&lang=fr";					
			     }
				
			}else{
                 if(str=='nl'){ 
					location.search=ls.replace("=fr","=nl")
				 }else{
				    location.search=ls.replace("=nl","=fr")
				 }
            }
   }
 */