function PonerDir(c4, c2, c3, c1)
{
//        var c4 = "ilto";        
//        var c2 = "dominio.com"; 
//        var c3 = "ma";  
//        var c1 = "info";   
        
        PonerDir2(c1,c2,c3,c4);   
}

function PonerDir2(c1,c2,c3,c4)
{
    document.write("<a href=" + c3 + c4 + ":" + c1 + "@" + c2 + ">" + c1 + "@" + c2 + "</a>")
}


function PonerDirEva(elem) {
        var c1 = "eva";
        var c2 = "yourguidebarcelona.com"; 
        var c3 = "ma";
        var c4 = "ilto";

        elem.href = c3 + c4 + ':' + c1 + '@' + c2 ;
    }
    
function PonerDirAlberto(elem) {
        var c1 = "alberto";
        var c2 = "yourguidebarcelona.com"; 
        var c3 = "ma";
        var c4 = "ilto";

        elem.href = c3 + c4 + ':' + c1 + '@' + c2 ;
    }