function mk_em_str(dom,usr,lbl,cls) { // lbl is optional label for address
var s1 = '<a href="mailto:',s2='@',s3='"',s3a=' class="',s4='>',s5='</a>',slbl,em_str,str,strx="";
if(lbl==null)lbl='';em_str=usr+s2+dom;
if(lbl!=''){slbl=lbl;}else{slbl=em_str;}
if(cls!=''){strx=s3a+cls+s3;}
str=s1+em_str+s3+strx+s4+slbl+s5;document.write(str);
}