function Change_Pic()
{
	document.getElementById("kafedru").setAttribute("src","images/kaf_but_hover.jpg");
}
function Change_Pic_2()
{
	document.getElementById("kafedru").setAttribute("src","images/kafedru_but.jpg");
}

function Change_Pic_2_2()
{
	document.getElementById("norm_base").setAttribute("src","images/norm_base_but_hover.jpg");
}
function Change_Pic_2_2_2()
{
	document.getElementById("norm_base").setAttribute("src","images/norm_base_but.jpg");
}

function Change_Pic_3_3()
{
	document.getElementById("vchut_dos").setAttribute("src","images/vchut_dos_but_hover.jpg");
}
function Change_Pic_3_3_3()
{
	document.getElementById("vchut_dos").setAttribute("src","images/vchut_dos_but.jpg");
}

function Change_Pic_4_4()
{
	document.getElementById("olimp").setAttribute("src","images/olimps_but_hover.jpg");
}
function Change_Pic_4_4_4()
{
	document.getElementById("olimp").setAttribute("src","images/olimps_but.jpg");
}

function Change_Pic_5_5()
{
	document.getElementById("calendar").setAttribute("src","images/calendar_but_hover.jpg");
}
function Change_Pic_5_5_5()
{
	document.getElementById("calendar").setAttribute("src","images/calendar_but.jpg");
}

function Change_Pic_6_6()
{
	document.getElementById("usefull").setAttribute("src","images/usefull_links_but_hover.jpg");
}
function Change_Pic_6_6_6()
{
	document.getElementById("usefull").setAttribute("src","images/usefull_links_but.jpg");
}

function Change_Pic_aboutHover()
{
	document.getElementById("about").setAttribute("src","images/about_but_hover.jpg");
}
function Change_Pic_aboutOut()
{
	document.getElementById("about").setAttribute("src","images/about_but.jpg");
}

function Change_Pic_newsHover()
{
	document.getElementById("news").setAttribute("src","images/news_but_hover.jpg");
}
function Change_Pic_newsOut()
{
	document.getElementById("news").setAttribute("src","images/news_but.jpg");
}