function initRollovers() {
	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');
	
	for (var i = 0; i < aImages.length; i++) {
		if (aImages[i].className == 'imgover') {
			var src   = aImages[i].getAttribute('src');
			var fname = src.substring( 0                    , src.lastIndexOf('.') );
			var ftype = src.substring( src.lastIndexOf('.') , src.length           );
			if ( fname.substring( fname.length - 3 ) != '_ov' ) {
				var hsrc  = src.replace( ftype , '_ov' + ftype );
				
				aImages[i].setAttribute( 'hsrc' , hsrc );
				
				aPreLoad[i] = new Image();
				aPreLoad[i].src = hsrc;
				
				aImages[i].onmouseover = function() {
					sTempSrc = this.getAttribute('src');
					this.setAttribute('src', this.getAttribute('hsrc'));
				}	
				
				aImages[i].onmouseout = function() {
					if (!sTempSrc) sTempSrc = this.getAttribute( 'src' ).replace( '_ov' + ftype , ftype );
					this.setAttribute('src', sTempSrc);
				}
			}
		}
	}
}

window.onload   = initRollovers;
window.onunload = initRollovers;