function setIndexHeaderImage() {
 
	var randomMax = 6;
 
	var randomImg = Math.round(Math.random()*(randomMax-1))+1;
 
	if (randomImg < 10) {
		randomImg = "0"+randomImg;	
	}
		
	document.write('<img src="_images/headerImages/hi-index-'+randomImg+'.jpg" />');
 
}