<script language="javascript" type="text/javascript">
function getNewUrl(oldurl,paramname,pvalue,flag){
var reg = new RegExp("(\\?|&)"+ paramname +"=([^&]*)(&|$)","gi");
var pst=oldurl.match(reg);
if((pst==undefined) || (pst==null)) return (flag==0)?oldurl:(oldurl+((oldurl.indexOf("?")==-1)?"?":"&")+paramname+"="+pvalue);
var t=pst[0];
var retxt=t.substring(0,t.indexOf("=")+1)+pvalue;
if(t.charAt(t.length-1)=='&') retxt+="&";
return oldurl.replace(reg,retxt);
}
alert(getNewUrl("http://servername/virturlpath/index.asp?p1=123&attr[75]=aa&p3=hh&p4=1","attr[75]","cxz",1)); </script>
function getNewUrl(oldurl,paramname,pvalue,flag){
var reg = new RegExp("(\\?|&)"+ paramname +"=([^&]*)(&|$)","gi");
var pst=oldurl.match(reg);
if((pst==undefined) || (pst==null)) return (flag==0)?oldurl:(oldurl+((oldurl.indexOf("?")==-1)?"?":"&")+paramname+"="+pvalue);
var t=pst[0];
var retxt=t.substring(0,t.indexOf("=")+1)+pvalue;
if(t.charAt(t.length-1)=='&') retxt+="&";
return oldurl.replace(reg,retxt);
}
alert(getNewUrl("http://servername/virturlpath/index.asp?p1=123&attr[75]=aa&p3=hh&p4=1","attr[75]","cxz",1)); </script>
<script language="javascript" type="text/javascript">
function getNewUrl(oldurl,paramname,pvalue,flag){
var reg = new RegExp("(\\? ¦&)"+ paramname +"=([^&]*)(& ¦$)","gi");
var pst=oldurl.match(reg);
if((pst==undefined) ¦ ¦ (pst==null)) return (flag==0)?oldurl:(oldurl+((oldurl.indexOf("?")==-1)?"?":"&")+paramname+"="+pvalue);
var t=pst[0];
var retxt=t.substring(0,t.indexOf("=")+1)+pvalue;
if(t.charAt(t.length-1)=='&') retxt+="&";
return oldurl.replace(reg,retxt);
}
alert(getNewUrl("http://servername/virturlpath/index.asp?p1=123&attr[75]=aa&p3=hh&p4=1","attr\[75\]","cxz",1)); </script>