Code for adding JS Files at runtime and then executing Functions from currently loaded file.

/*-------This works for IE and non IE as well----------------*/

var oScript = document.createElement("script");

oScript.src = fileName.js;

document.body.appendChild(oScript);

if(browser=="NonIE")

oScript.onload = function(){callAFunction()}; 

else

oScript.onreadystatechange = function(){callAFunction()};