global variable losing value

i have a switch statement that displays certain parts of the page depending on what option the user chooses. i then need this variable passed along in the url bar and if multiple choices are made, them variables must be passed along too. here is my code:

var list
//alert(list)

function show()

{
//PageIndex2=getCookie();

PageIndex2=document.form1.options.selectedIndex;
//alert(PageIndex2)
switch (PageIndex2)
{
case 1:
{
showexport1();
var data = '1';
list = ''
list = list+'?case1=1'
var url = 'http://Process/test_Search.asp'+list;
document.location.href = url;
}
break
case 2:
{
showexport3();
var data = '2';
list = list+'&case2=2'
var url = 'http://Process/test_Search.asp'+list;
document.location.href = url;
}
break

the problem is that the global variable loses the data from case 1 when case 2 is called. would it be because the page is refreshing every time a case is selected? any help would be appreciated?!!

yep...


I think what you basicly want is something like:

any ideas on any other way to do this?!!