function preloadImages(){
	for(i=0;i<imgArray.length;i++){
		newImage[i] = new Image();
		newImage[i].src = imgArray[i];
	}
}



function showMenu(index){

	var leftImg	= document.getElementById("linkL"+index);
	var tempClass = document.getElementById("link"+index);
	var rightImg	= document.getElementById("linkR"+index);

	leftImg.src = "images/nav_onLeft.png";
	tempClass.className = "navOn";
	rightImg.src = "images/nav_onRight.png";
		
}

function hideMenu(index){

	var leftImg	= document.getElementById("linkL"+index);
	var tempClass = document.getElementById("link"+index);
	var rightImg	= document.getElementById("linkR"+index);

	leftImg.src = "images/nav_offLeft.png";
	tempClass.className = "navOff";
	rightImg.src = "images/nav_offRight.png";	

}