I tried to pass the variable mylist from Script#1 to Script#2. I couldn't use the indexOf operation on this variable in Script#2. Is it not a string after it's passed to Script#2?

Script#1:
var shoelist = "abc, efg, hijkl, mnop";
shoePhone.src = "newrec.asp?mylist=" + shoelist ;

Script#2:
var mylist= Request.QueryString("mylist");
var isrch = mylist.indexOf(",");

I have figured it out. Thanks.

If the string that the QueryString returns is consist of "value1, value2, value3", you must reconstruct this string into "value1,value2,value3" format before you can use the IndexOf operation on this new string in your page.