function addClassHover(that){
	var objNode = (typeof(this.nodeName)=='undefined') ? that : this ;
	objNode.className = objNode.className.replace('block','hoverblock');
}

function removeClassHover(that){
	var objNode = (typeof(this.nodeName)=='undefined') ? that : this ;
	objNode.className = objNode.className.replace('hoverblock','block');
}

function init(){
	var agt=navigator.userAgent.toLowerCase();
	var is_major = parseInt(navigator.appVersion);
    var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
    var is_ie3    = (is_ie && (is_major < 4));
    var is_ie4    = (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) );
    var is_ie4up  = (is_ie && (is_major >= 4));
    var is_ie5    = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
    var is_ie5_5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
    var is_ie5up  = (is_ie && !is_ie3 && !is_ie4);
    var is_ie5_5up =(is_ie && !is_ie3 && !is_ie4 && !is_ie5);
    var is_ie6    = (is_ie && (is_major == 4) && (agt.indexOf("msie 6.")!=-1) );
    var is_ie6up  = (is_ie && !is_ie3 && !is_ie4 && !is_ie5 && !is_ie5_5);
	
	var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
    var is_mac    = (agt.indexOf("mac")!=-1);
	
	if (is_ie5up && is_win) {
		var x = document.getElementById('footer');
		if (!x) return;
		var y = x.getElementsByTagName('div');
		for (var i=0;i<4;i++) {
			y[i].onmouseover = addClassHover;
			y[i].onmouseout = removeClassHover;
		}
	}
}

init();