function Link(t, u)
{
var c ="<a href='"+u+"' >"+t +"</a>";
return(c)
}

function Mail(tekst)
{
url ="mailto:"+"ma"+"rtinr@"+"fi.uu"+".nl";  
url +=",gera"+"rdk@"+"fi.uu"+ ".nl?subject=wiskundewebmasters";
document.write (Link(tekst,url))	
}