function NavOn(name)
{
	document.getElementById("nav_"+name).src = 'images/nav_'+name+'_on.png';
}
function NavOff(name)
{
	document.getElementById("nav_"+name).src = 'images/nav_'+name+'_off.png';
}
function NavOnAdmin(name) {
    document.getElementById("nav_" + name).src = '../images/nav_' + name + '_on.png';
}
function NavOffAdmin(name) {
    document.getElementById("nav_" + name).src = '../images/nav_' + name + '_off.png';
}
function register()
{
	if(document.getElementById('register').style.display=='none')
		document.getElementById('register').style.display='block';
	else
		document.getElementById('register').style.display='none'
}