function img_hover(in_id, act)
{
	//alert(document.getElementById(in_id).src.indexOf("_akt.gif"));
	
	if(document.getElementById(in_id).src.indexOf("_akt.gif") == -1)
	{
		if (act == "over") {
			document.getElementById(in_id).src = 'img/navi/' + in_id + '_hov.gif';
		} else {
			document.getElementById(in_id).src = 'img/navi/' + in_id + '.gif';
		}
	}
}


function img_mhover(in_id, act)
{

	if (act == "over") {
		document.getElementById(in_id).src = 'img/header_email_hov.jpg';
	} else {
		document.getElementById(in_id).src = 'img/header_email.jpg';
		}

}


function tnav_hover(in_id, act)
{
		
	if(document.getElementById(in_id).src.indexOf("_akt.png") == -1)
	{
		if (act == "over") {
			document.getElementById(in_id).src = 'img/tnav_' + in_id + '_hov.png';
		} else {
			document.getElementById(in_id).src = 'img/tnav_' + in_id + '.png';
		}
	}
}