var adress = 'sangiorgio_at_sangiorgio_dot_nl';
function get_adress(){
var re= /_at_/gi;
adress = adress.replace(re,'@');
var re= /_dot_/gi;
adress = adress.replace(re,'.');
var the_link="mai" + "lto" +":"+adress+"?subject=Mijn vraag is:" ;
window.location=the_link;

}