// preload
if (document.images) {
	preload_image_object = new Image();
	// set image url
	image_url = new Array();
	image_url[0] = "img/bullet_on.png";
	image_url[1] = "img/title_print.png";
	image_url[2] = "img/title_design.png";
	image_url[3] = "img/title_broadcast.png";
	image_url[4] = "img/title_resume.png";
	image_url[5] = "img/nextlabel.gif";
	image_url[6] = "img/prevlabel.gif";	
	
	var i = 0;
	for(i=0; i<=6; i++) 
	preload_image_object.src = image_url[i];
}

function swapTitle(changeTo) {
		document.getElementById('pagetitle-image').src='img/title_'+changeTo+'.png';
}

// toggle display:block attribute of an element
function showHide(whichDiv) {
	if (document.getElementById(whichDiv).style.display == "none") {
		document.getElementById(whichDiv).style.display = "block";
	} else {
		document.getElementById(whichDiv).style.display = "none";
	}
}