// JavaScript Document

function roll_over(img_name, img_src)
   {
   document[img_name].src = img_src;
   }
   
   
//  begin preloads -->


var image1 = new Image();
image1.src = "../images/home-nav_about_ro.gif";

var image2 = new Image();
image2.src = "../images/home-nav_contact_ro.gif";

var image3 = new Image();
image3.src = "../images/home-nav_doityourself_ro.gif";

var image4 = new Image();
image4.src = "../images/home-nav_exhibitions_ro.gif";

var image5 = new Image();
image5.src = "../images/home-nav_submissions_ro.gif";





function isIE() {
		var useragent = navigator.userAgent.toLowerCase();
		if( useragent.indexOf('msie') != -1 ) {
			return 1;
		}
		return 0;
}

function isIE5Mac() {
		var useragent = navigator.userAgent.toLowerCase();
		if( isIE() && useragent.indexOf('powerpc') != -1 ) {
			return 1;
		}
		return 0;
}

var Images = {
	fixIEPNG: function() { /* from http://homepage.ntlworld.com/bobosola/index.htm */
		var images = document.getElementsByTagName('IMG');
		if( !isIE() ) {
			return;
		}
		if( isIE5Mac() ) {
			return;
		}
		for (var i = 0; i < images.length; i++) {
			if (new String(images[i].src).match(/\.png$/)) {
				var img = images[i];
				var imgID = (img.id) ? "id='" + img.id + "' " : ""
				var imgClass = (img.className) ? "class='" + img.className + "' " : ""
				var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
				var imgStyle = "display:inline-block;" + img.style.cssText 
				if (img.align == "left") imgStyle = "float:left;" + imgStyle
				if (img.align == "right") imgStyle = "float:right;" + imgStyle
				if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
				var strNewHTML = "<span " + imgID + imgClass + imgTitle
				+ " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
				+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
				+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
				img.outerHTML = strNewHTML
				i = i - 1
			}
		}
	}
};