function pegaLink(element){ 
	var tagsA = element.getElementsByTagName('a'); 
	if (tagsA != null){ 
		window.location.href = tagsA[0].href; 
	} 
 } 
 
function hoverDiv() {
	if(!document.getElementById || !document.getElementsByTagName) return false;
	var x = document.getElementById('caixas');
	var divs = x.getElementsByTagName('div');
	for (var i=0; i<divs.length; i++) {
		divs[i].onmouseover = function () {
			if (this.className == 'box')
			this.className += ' hover';
		}
		divs[i].onmouseout = function () { 
			if (this.className == 'box hover')
			this.className = 'box';
		}
		divs[i].onclick = function() {
			pegaLink(this);
		}
	}
}

addLoadEvent(hoverDiv);