function menuDeroulant(){

var lis=document.getElementsByTagName("li");

	for (var i=0;i<lis.length;i++){
		
		if(lis[i].getElementsByTagName("ul")[0]!=null){
			//lis[i].style.backgroundColor="yellow";
			lis[i].onmouseover=function(){
				this.getElementsByTagName("ul")[0].style.display="block";};
			lis[i].onmouseout=function(){
				this.getElementsByTagName("ul")[0].style.display="none";};
		
		
};
};
}	

window.onload=menuDeroulant;