//	alert('IE');

	window.onload = function() {
		var imgs = document.getElementsByTagName('img');

		for (var i = 0; i < imgs.length; i++) {
			if (imgs[i] && (imgs[i].src.indexOf('-on') != -1)) {
				if (imgs[i].src.indexOf('volver') != -1) {
					imgs[i].style.cursor = 'pointer';
					imgs[i].style.marginTop = '1em';
					imgs[i].title = 'volver';
				
					imgs[i].onclick = function() {
						history.back();
					}
				}
				
				imgs[i].onmouseover = function() {
					this.src = this.src.split('-on').join('-off');
				}
				imgs[i].onmouseout = function() {
					this.src = this.src.split('-off').join('-on');
				}
			}
			else if (imgs[i] && (imgs[i].src.indexOf('-off') != -1)) {
				if (imgs[i].src.indexOf('volver') != -1) {
					imgs[i].style.cursor = 'pointer';
					imgs[i].style.marginTop = '1em';
					imgs[i].title = 'volver';
				
					imgs[i].onclick = function() {
						history.back();
					}
				}
				
				imgs[i].onmouseover = function() {
					this.src = this.src.split('-off').join('-on');
				}
				imgs[i].onmouseout = function() {
					this.src = this.src.split('-on').join('-off');
				}
			}
		}
	}