var kenBurstY = -1;
var kenBurstX = -1;
var kenBurstDown = true; 
var kenBurstLeft = true;

function kenBurst() {
	var width = "width: 800px;";
	var backgroundImage = "background-image: url(images/kenburst.jpg);"
	var backgroundY = "background-position: " + kenBurstX +"px " + kenBurstY + "px;";
	var head = document.getElementById("masthead");

	if(kenBurstY > -1) 
		kenBurstDown = true;
	if(kenBurstY < -200) 
		kenBurstDown = false;
	
	if(kenBurstX < 0)
		kenBurstLeft = true;
	if(kenBurstX > 200)
		kenBurstLeft = false;
	
	if(kenBurstDown) 
		kenBurstY = kenBurstY - 0.20;
	else 
		kenBurstY = kenBurstY + 0.20;
	
	if(kenBurstLeft)
		kenBurstX = kenBurstX + 0.20;
	else 
		kenBurstX = kenBurstX - 0.20;
	
	head.style.cssText = width + backgroundImage + backgroundY;
	setTimeout("kenBurst()",20);
}

function startKenBurst() {
	kenBurst();
}