function animateObject(obj , delay){
	//alert(tim);
	setTimeout(function(){
		var pix = -400;
		//obj.style.left = obj.style.left+"px";
		var intAnimation = setInterval( function(){
			pix+=8;
			obj.style.left = pix+"px";
			if( parseInt(pix) == (4*10)) {
				intAnimation = clearInterval(intAnimation);
				intAnimation = setInterval( function(){
					pix-=4;
					obj.style.left = pix+"px";
					if( parseInt(pix) <= 0 ) intAnimation = clearInterval(intAnimation);
				} ,10);
			}
		} ,2);
	} , delay);
}
window.onload = function(){
	var menu = document.getElementById('main_menu');
	//alert(menu.childNodes.length);
	for(i=0; i < menu.childNodes.length; i++){
		if(menu.childNodes[i].tagName){
			menu.childNodes[i].style.left = "-200px";
			animateObject(menu.childNodes[i] , i * 100);
		}	
	}
}