Javascript Button click Issue

Hi Gurus,

 

 Please find the code below:

 

 

 

 Default2.aspx

 

 

 

1) I am redirecting from Default.aspx page with querystring,It looks like this:

eg: http://localhost/Default2.aspx?CustomerId=1&ItemId=1

2)In Default2.aspx,I have buttons 1 to 10 (pasted above).

3)If i click on those button,it should attach to the querystring in the url:

eg: http://localhost/Default2.aspx?CustomerId=1&ItemId=1&Page=1

4) But now my issue is : if i click on 1st button - url changes to

eg: http://localhost/Default2.aspx?Page=1

5) i wanted the url like

http://localhost/Default2.aspx?CustomerId=1&ItemId=1&Page=1

and the page number should change based on the button clicked.

How to achieve this. Please help me with this.



Thanks in Advance.