Inserted JavaScript by usercontrol invokes only on first page

[NICEASS]

I have used a user control to get data from database and render it as MegaMenu anchors.In code-behind file I have got data and rendered it by using a literal.The megamenu.js file (containging myMega.Init method) has been inserted into header elementI have added following script tag into .ascx file.\[code\]<script type="text/javascript"> myMega.Init("mer_id", "anchor_id", "click");</script>\[/code\]I have several .aspx files which have same master page. The master page registers the User Control and contains following tag exact before .\[code\] <uc:MegaMenu id="anchors" runat="server"></uc:MegaMenu>\[/code\]the problem is the myMega.Init only invokes when I go to firstpage.aspx. I have debugged by hitting f12 and choosing debugg Script. the init file invokes only first time (firstpage) not other pages. thank you for your help.