1 function changeURLPar(url, ref, value) {
2 var str = "";
3 if (url.indexOf('?') != -1)
4 str = url.substr(url.indexOf('?') + 1);
5 else
6 return url + "?" + ref + "=" + value;
7 var returnurl = "";
8 var setparam = "";
9 var arr;
10 var modify = "0";
11 if (str.indexOf('&') != -1) {
12 arr = str.split('&');
13 for (i in arr) {
14 if (arr[i].split('=')[0] == ref) {
15 setparam = value;
16 modify = "1";
17 }
18 else {
19 setparam = arr[i].split('=')[1];
20 }
21 returnurl = returnurl + arr[i].split('=')[0] + "=" + setparam + "&";
22 }
23 returnurl = returnurl.substr(0, returnurl.length - 1);
24 if (modify == "0")
25 if (returnurl == str)
26 returnurl = returnurl + "&" + ref + "=" + value;
27 }
28 else {
29 if (str.indexOf('=') != -1) {
30 arr = str.split('=');
31 if (arr[0] == ref) {
32 setparam = value;
33 modify = "1";
34 }
35 else {
36 setparam = arr[1];
37 }
38 returnurl = arr[0] + "=" + setparam;
39 if (modify == "0")
40 if (returnurl == str)
41 returnurl = returnurl + "&" + ref + "=" + value;
42 }
43 else
44 returnurl = ref + "=" + value;
45 }
46 return url.substr(0, url.indexOf('?')) + "?" + returnurl;
47 }
