var _elem = "div";
var _className = "h-div";
var _hoverClass = "box-hover";

function boxHover()
{
	var block = document.getElementsByTagName(_elem);
	for (var z=0; z<block.length; z++)
		{
		if (block[z].className.indexOf(_className) != -1)
			{
				block[z].onmouseover = function() 
				{
					this.className +=" "+ _hoverClass;
				}
				block[z].onmouseout = function()
				{
					this.className = this.className.replace( _hoverClass, "");
			}
		}
	}
}
if (window.attachEvent){window.attachEvent("onload", boxHover);}