function sol_menu_1()
{
	document.getElementById("menu_1").src="images/solution_tit_01.gif";
	document.getElementById("menu_2").src="images/solution_tit_02.gif";
    document.getElementById("menu_3").src="images/solution_tit_04.gif";
	document.getElementById("menu_4").src="images/solution_tit_03.gif";
	document.getElementById("sol_menu_1").className="content_block";
	document.getElementById("sol_menu_2").className="content_none";
	document.getElementById("sol_menu_3").className="content_none";
	document.getElementById("sol_menu_4").className="content_none";
}
function sol_menu_2()
{
	document.getElementById("menu_1").src="images/solution_tit_01_1.gif";
	document.getElementById("menu_2").src="images/solution_tit_02_1.gif";
    document.getElementById("menu_3").src="images/solution_tit_04.gif";
	document.getElementById("menu_4").src="images/solution_tit_03.gif";
	document.getElementById("sol_menu_1").className="content_none";
	document.getElementById("sol_menu_2").className="content_block";
	document.getElementById("sol_menu_3").className="content_none";
	document.getElementById("sol_menu_4").className="content_none";
}
function sol_menu_3()
{
	document.getElementById("menu_1").src="images/solution_tit_01_1.gif";
	document.getElementById("menu_2").src="images/solution_tit_02.gif";
    document.getElementById("menu_3").src="images/solution_tit_04_1.gif";
	document.getElementById("menu_4").src="images/solution_tit_03.gif";
	document.getElementById("sol_menu_1").className="content_none";
	document.getElementById("sol_menu_2").className="content_none";
	document.getElementById("sol_menu_3").className="content_block";
	document.getElementById("sol_menu_4").className="content_none";
}
function sol_menu_4()
{
	document.getElementById("menu_1").src="images/solution_tit_01_1.gif";
	document.getElementById("menu_2").src="images/solution_tit_02.gif";
    document.getElementById("menu_3").src="images/solution_tit_04.gif";
	document.getElementById("menu_4").src="images/solution_tit_03_1.gif";
	document.getElementById("sol_menu_1").className="content_none";
	document.getElementById("sol_menu_2").className="content_none";
	document.getElementById("sol_menu_3").className="content_none";
	document.getElementById("sol_menu_4").className="content_block";
}