function start_links()
{
	var links = document.getElementById("menu").getElementsByTagName("a");

	for(var i=0;i<links.length;i++)
	{
		links[i].i = i +1;
		links[i].old = links[i].getElementsByTagName("img")[0].getAttribute("src");

		links[i].onmouseover=function()
		{
			if(this.className != "on") this.getElementsByTagName("img")[0].setAttribute("src",this.getElementsByTagName("img")[0].getAttribute("src").replace(".jpg","_on.jpg")) ;
		}

		links[i].onmouseout=function()
		{
			this.getElementsByTagName("img")[0].setAttribute("src",this.old) ;
		}
		
	}
}

function start_column()
{

	var column = document.getElementById("column");
	column.onmouseover = function()
	{
		var thisColumn = this;
		var columnMenu = document.getElementById("columnMenu");
		columnMenu.style.display = "block";
		
		this.getElementsByTagName("img")[0].setAttribute("src","./img/menu3_on.jpg") ;
		
		columnMenu.onmouseover = function()
		{
			thisColumn.getElementsByTagName("img")[0].setAttribute("src","./img/menu3_on.jpg") ;
			this.style.display = "block";
		}
		
		columnMenu.onmouseout = function()
		{
			thisColumn.getElementsByTagName("img")[0].setAttribute("src","./img/menu3.jpg") ;
			this.style.display = "none";
		}
	}
	
	column.onmouseout = function()
	{
		this.getElementsByTagName("img")[0].setAttribute("src","./img/menu3.jpg") ;
		var columnMenu = document.getElementById("columnMenu");
		columnMenu.style.display = "none";	
	}

}