function repl(str,oldtxt,newtxt){
pos=str.indexOf(oldtxt);
ln=oldtxt.length;
if (pos>=0) return str.substring(0,pos)+newtxt+str.substring(pos+ln, str.length);
else return str;
}

function repl_url(oldt, newt){	
for ( i=0; lnk=document.links[i] ; i++){ 
if ( lnk.href.indexOf(oldt) >= 0 ) {
	vurl=repl(lnk.href,oldt,newt);
	if ( ownerID && lnk.href.indexOf('&o=') < 0 ) vurl=vurl+'&o='+ownerID;
	if (addstr && lnk.href.indexOf(addstr) < 0) vurl=vurl+addstr;
	lnk.href=vurl;
}}}