function switchFilter(id,page,filter, mixed){

	if(filter=="type" && String(id)=="none"){
		window.location=page+"?"+filter+"=none";
		return;
	}

	if(mixed==0){
		window.location=page+"?"+filter+"="+id;
	}else{
	//var querystring = location.search;	
	var urlString=self.location.href.split("?");
		if(urlString[1]==undefined || urlString[1]=="" || urlString[1]=="type=none"){
			window.location=page+"?"+filter+"="+id;
		}else{
			//prima di procedere elimino il parametro pNum
			
			if(urlString[1].indexOf("Rs1pNum=")==-1){
				var paramString=urlString[1];
			}else{
				var strippingParamArray=urlString[1].split("Rs1pNum")
				// Se pNum è l'ultimo parametro...
				if(strippingParamArray[1].indexOf("&")==-1){
					var paramString=strippingParamArray[0];
				}else{
					var otherParams=strippingParamArray[1].split("&")
					otherParams=otherParams.slice (1,otherParams.length );
					
					var paramString=otherParams.join("&");

				}
				
				
			}
			
	
			var params=paramString.split("&")
			var totParams=params.length;
			var paramFound=false;

			for(i=0;i<params.length;i++){
				if(params[i].split("=")[0]==filter){
					var paramFound=true;
					if(id!=0){
						params[i]=filter+"="+id;
					}else{
						params.splice(i,1);
					}					
				}
			}
			if(paramFound==false){
				params.push(filter+"="+id)
			}
			
			var querystring=params.join("&");

			window.location=urlString[0]+"?"+querystring
		}
	}	

}