function mk_ajouter(champ, ms1) 
{ 
if (document.selection) 
{ 
champ.focus(); 
sel = document.selection.createRange(); 
if (sel.text.length == 0) 
{ 
sel.text = ms1; 
} 
else 
{ 
sel.text= ms1 += sel.text + ms1; 
} 
} 
}