//implementation
//javascript:var headID = document.getElementsByTagName("head")[0];var newScript = document.createElement('script');newScript.type = 'text/javascript';newScript.src = 'http://www.jcasolutions.com/hello.js';headID.appendChild(newScript);sayHello();
function sayHello()
{
alert("hello world");
bodyID = document.getElementsByTagName("body")[0];
newDiv = document.createElement('div');
newDiv.innerHTML = "Hello World !!! I am on " + document.location.href;
newDiv.style.position = "absolute";
newDiv.style.top = "0px";
newDiv.style.left = "0px";
bodyID.appendChild(newDiv);

}