function comparar()
{
	tam=document.fComp.comparativa.length;
	prods="";
	for(var i=0;i<tam;i++)
	{
		if(document.fComp.comparativa[i].checked)
			prods=prods+document.fComp.comparativa[i].value+"-";
	}
	
 		thispage=window.location.href;
 		
 		prefix=thispage.substring(0,thispage.lastIndexOf('?'));
 		
 		if (prefix =="")
 		{
 		
 				prefix=thispage;
 				param="comparativa?_Comparativa_WAR_LTD_Portlets_comparativa="+prods;			
 		}
 		else
 		{
 		
 			prefix1=prefix.substring(0,prefix.lastIndexOf('/'));
 			
 			param="/comparativa?_Comparativa_WAR_LTD_Portlets_comparativa="+prods; 				
 		}
 		
 		URL=prefix1+param;
 		
 		window.location.href= URL;
 }


function compararPres()
{
	tam=document.fComp.comparativa.length;
	prods="";
	for(var i=0;i<tam;i++){
		if(document.fComp.comparativa[i].checked)
			prods=prods+document.fComp.comparativa[i].value+"-";
	}
	
 		thispage=window.location.href;
 		prefix=thispage.substring(0,thispage.lastIndexOf('?'));
 		if (prefix =="")
 		{
 				prefix=thispage;
 				param="comparativa?_ComparativaPres_WAR_LTD_Portlets_comparativa="+prods;			
 		}
 	else
 		{
 			prefix1=prefix.substring(0,prefix.lastIndexOf('/'));
 			param="/comparativa?_ComparativaPres_WAR_LTD_Portlets_comparativa="+prods; 				
 		}
 		
 		URL=prefix1+param;
 		window.location.href= URL;
 }