function initPage(){
	var classList = new Array("navigation_list");
	for(j=0; j<classList.length; j++){
		var _obj = document.getElementsByTagName("ul");
		for(k=0; k<_obj.length; k++){
			if(_obj[k].className.indexOf(classList[j]) !=-1) {
				_list = _obj[k].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);