Load external Javascript in Dynamics CRM

Here is the code to load the external javascript (.js file) in dynamics CRM 4.0.

On Case entity –> form property –> On load

var script = document.createElement(‘script’);
script.language = ‘javascript’;
script.src = “/ISV/JS/JavascriptFolder/CaseOnLoadOnSaveMod.js”;
document.getElementsByTagName(‘head’)[0].appendChild(script);
var f = function()
{
if (event.srcElement.readyState == “loaded” || event.srcElement.readyState == “complete”)
//displaymessage();
CaseOnLoad();
}
script.attachEvent(“onreadystatechange”, f);

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