var ic = 6;
var image = new Array(6);

image[0] = "images/header1.jpg"; 
image[1] = "images/header2.jpg"; 
image[2] = "images/header3.jpg"; 
image[3] = "images/header4.jpg"; 
image[4] = "images/header5.jpg"; 
image[5] = "images/header6.jpg"; 

function pickRandom(range) 
{ 
	if (Math.random)
	{
		return Math.round(Math.random() * (range-1)); 
	}
	else 
	{ 
		var now = new Date(); 
		return (now.getTime() / 1000) % range; 
	} 
} 
var choice = pickRandom(ic);