function navChange()
{

	var nav = document.getElementById("nav");
	var ul = nav.getElementsByTagName("ul")[0];
	var li = ul.getElementsByTagName("li");
	var cur = 0;
	for(var i = 0; i < li.length; i++)
	{

		if(li[i].className == "first cur_l")
		{
			cur = 0;
		}
		else if(li[i].className == "last cur_r")
		{
			cur = (li.length - 1);
		}
		else if(li[i].className == "cur")
		{
			cur = i;
		}

		li[i].onmouseover = function (i){ return ( function (){
			
			if(i == 0 || i == (li.length - 1))
			{
				
				if(i == 0)
				{
					var c_name = "first";
					this.className = c_name + " cur_l";

				}
				else if(i == (li.length - 1))
				{
					var c_name = "last"
					
					this.className = c_name + " cur_r";
					
					
				}
				
				
				if(cur !== i)
				{
					this.onmouseout = function (i){
							
						this.className = c_name;
					}
				}
			}
			else
			{
				this.className = "cur";
				if(cur !== i)
				{
					this.onmouseout = function (i){
							
						this.className = "";
							
					}
				}
				
			}

		})}(i);
			
	}



}