var hdress = 'herman.oosten_at_hbmgroup_dot_com';
function get_hdress(){
var re= /_at_/gi;
hdress = hdress.replace(re,'@');
var re= /_dot_/gi;
hdress = hdress.replace(re,'.');
var the_link="mai" + "lto" +":"+hdress+"?subject=My question/remark is:" ;
window.location=the_link;

}