//pre-cache nav images
	var navImgSrcStrings = new Array();
	navImgSrcStrings[0] = "assets/dlp_nav_about.gif";
	navImgSrcStrings[1] = "assets/dlp_nav_portfolio.gif";
	navImgSrcStrings[2] = "assets/dlp_nav_packages.gif";
	navImgSrcStrings[3] = "assets/dlp_nav_contact.gif";
	navImgSrcStrings[4] = "assets/dlp_block_arrow.gif";
	navImgSrcStrings[5] = "assets/dlp_block_arrow.gif";
	navImgSrcStrings[6] = "assets/dlp_folio_nav_bridals.gif";
	navImgSrcStrings[7] = "assets/dlp_folio_nav_engage.gif";
	navImgSrcStrings[8] = "assets/dlp_folio_nav_pjournal.gif";
	navImgSrcStrings[9] = "assets/dlp_folio_nav_weddings.gif";
	navImgSrcStrings[10] = "assets/dlp_folio_nav_left.gif";
	navImgSrcStrings[11] = "assets/dlp_folio_nav_right.gif";
	
	var offState = new Array();
	var onState = new Array();
	
	function precache(){
		for(var i in navImgSrcStrings){
			arrKey = "nav" + i;
			offState[arrKey] = new Image();
			offState[arrKey].src = navImgSrcStrings[i]
			onStateStr = navImgSrcStrings[i].slice(0,-4);
			onStateStr += "_1.gif";
			onState[arrKey] = new Image();
			onState[arrKey].src = onStateStr;
		}
	}	

	//toggle on/off state
	function swap(img){
		currSrc = document.getElementById(img).src;
		if(currSrc.indexOf("_1.gif") != -1){
			document.getElementById(img).src = offState[img].src;
		} else {
			document.getElementById(img).src = onState[img].src;
		}
	}
	
	precache();