var toolbar = document.all.mnuBar2.rows(0).cells(0);
var html = "<SPAN tabindex='0' class='menu' style='padding:4px 4px 0px 4px' pl='4' pr='4' title='Button Title' onclick='yourFunction()' id='idhere'><DIV class='mnuBtn'><IMG src='/_imgs/ico_16_rpt_custom.gif' class='mnuBtn'>Button Title</DIV></SPAN>";
toolbar.insertAdjacentHTML("beforeEnd", html);
yourFunction= function()
{
var singuid = crmForm.all.SomeCRMFieldHere.DataValue;
if(singuid !=null){
var guid = singuid[0].id;
var site= "http://yourCustomApplicatoin.com/default.aspx?"+guid ;
window.open(site, "mywindow","menubar=0,resizable=0,width=375,height=250");
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