a nice easy one to generate a random string. i use this one to stop items from caching or you could use it as a guid.

var nocache = Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);

Idea: This could also work as a password generator.

test

..

here is the random function code

function random() {
	var random = Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);
	document.getElementById('random').innerHTML = random;
}