//Rollover button function
function rolloverButtons(img_name, img_src){
	if(document[img_name].src != img_src){
		document[img_name].src = img_src;
	}
}

//Toggle nav button background colour
function rolloverSubButtons(div_name, img_src) {
	document.getElementById(div_name).style.backgroundImage = "url(" + img_src + ")";
}

//Toggle display image
function toggle(element) {
	if (document.getElementById(element).style.display == "none") {
		document.getElementById(element).style.display = "block";
	} else {
		document.getElementById(element).style.display = "none"
	}
}

//Pop-up image function
function popUp(urlVar) {
	galleryWindow = window.open (("popup.php?image=" + urlVar), 'Imagengine', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=940,height=630');
}