calling code behind method using ajax dll problem

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ASP.NET

Javascript

hi.

i call a code behind method using AjaxPro dll which is having a 2 parameter strNode,comid and value is

System.Web.UI.WebControls.TreeNode , c00 respectively

i.e.

function treeview(strNode,comid)
{
    alert(MIS_frmaccountmapping.Fill_ACC(strNode,comid));
}

code behind method is like this

public void Fill_ACC(TreeNode Node, string comp_id)
 {
 }

so on execution gives me error

Uncaught ReferenceError: MIS_frmaccountmapping is not defined
treeview