function initPage()
{
	var _menu = document.getElementById("navigation");
	if(_menu)
	{
		var _list = _menu.getElementsByTagName('a');
		for(var i = 0; i < _list.length; i++)
		{
			_list[i].onmousedown = function()
			{
				
				if(this.className.indexOf('push') == -1) this.className += ' push';
			}
			_list[i].onmouseup = function() {
				this.className = this.className.replace('push','');
			} 
		}
	}
}

if (window.addEventListener)
	window.addEventListener("load", initPage, false);
else if (window.attachEvent && !window.opera)
	window.attachEvent("onload", initPage);