function mouse_over(element_in)
{

	switch(element_in.id)
	{
		case "n_01":		document.getElementById("b_01").style.display = "block";
							document.getElementById("b_02").style.display = "none";
							document.getElementById("b_03").style.display = "none";
							document.getElementById("b_04").style.display = "none";
							document.getElementById("b_05").style.display = "none";
							break;
		
		case "n_02":		document.getElementById("b_01").style.display = "none";
							document.getElementById("b_02").style.display = "block";
							document.getElementById("b_03").style.display = "none";
							document.getElementById("b_04").style.display = "none";
							document.getElementById("b_05").style.display = "none";
							break;
		
		case "n_03":		document.getElementById("b_01").style.display = "none";
							document.getElementById("b_02").style.display = "none";
							document.getElementById("b_03").style.display = "block";
							document.getElementById("b_04").style.display = "none";
							document.getElementById("b_05").style.display = "none";
							break;
		
		case "n_04":		document.getElementById("b_01").style.display = "none";
							document.getElementById("b_02").style.display = "none";
							document.getElementById("b_03").style.display = "none";
							document.getElementById("b_04").style.display = "block";
							document.getElementById("b_05").style.display = "none";
							break;
		
		case "n_05":		document.getElementById("b_01").style.display = "none";
							document.getElementById("b_02").style.display = "none";
							document.getElementById("b_03").style.display = "none";
							document.getElementById("b_04").style.display = "none";
							document.getElementById("b_05").style.display = "block";
							break;
	}
	
	element_in.style.backgroundImage = 'url(./images/n_bg_hover.jpg)';
}


function mouse_out(element_in)
{
	element_in.style.backgroundImage = 'url(./images/n_bg.jpg)';
}