pagination problem

Hello,
 
I want to add paignation options to my template but It doesn't work
correctly.
 
if I write:
<a
href="javascript:changePage(document.myForm,document.myForm.ctnscroll_co
ntacts,'5_5');"> Next>></a>
 
it works
 
but with the jahia tag:
<jahia:nextWindowButton title="Next&gt;&gt;" method="post"
formName="myForm" />
 
it doesn't work.
 
thanks