function nav1On()
{
   document.getElementById('title').style.background = 'url(http://www.mendel.tv/images/nav_on_01.gif)';
  
}

function nav2On()
{
	document.getElementById('navcontainer').style.display = '';
	document.getElementById('title2').style.background = 'url(http://www.mendel.tv/images/nav_on_02.gif)';
}

function nav3On()
{
	document.getElementById('navcontainer2').style.display = '';
	document.getElementById('title3').style.background = 'url(http://www.mendel.tv/images/nav_on_03.gif)';
}

function nav4On()
{
	document.getElementById('title4').style.background = 'url(http://www.mendel.tv/images/nav_on_04.gif)';
}

function nav5On()
{
	document.getElementById('title5').style.background = 'url(http://www.mendel.tv/images/nav_on_05.gif)';
}








function nav1Off()
{
   document.getElementById('title').style.background = 'url(http://www.mendel.tv/images/nav_01.gif)';

}

function nav2Off()
{
   document.getElementById('navcontainer').style.display = 'none';
   document.getElementById('title2').style.background = 'url(http://www.mendel.tv/images/nav_02.gif)';

}

function nav3Off()
{
   document.getElementById('navcontainer2').style.display = 'none';
   document.getElementById('title3').style.background = 'url(http://www.mendel.tv/images/nav_03.gif)';

}

function nav4Off()
{
   document.getElementById('title4').style.background = 'url(http://www.mendel.tv/images/nav_04.gif)';

}

function nav5Off()
{
   document.getElementById('title5').style.background = 'url(http://www.mendel.tv/images/nav_05.gif)';

}









function nav1X()
{
   document.getElementById('title').style.background = 'url(http://www.mendel.tv/images/nav_on_01.gif)';

}

function nav2X()
{
   document.getElementById('navcontainer').style.display = 'none';
   document.getElementById('title2').style.background = 'url(http://www.mendel.tv/images/nav_on_02.gif)';

}

function nav3X()
{
   document.getElementById('navcontainer2').style.display = 'none';
   document.getElementById('title3').style.background = 'url(http://www.mendel.tv/images/nav_on_03.gif)';

}

function nav4X()
{
   document.getElementById('title4').style.background = 'url(http://www.mendel.tv/images/nav_on_04.gif)';

}

function nav5X()
{
   document.getElementById('title5').style.background = 'url(http://www.mendel.tv/images/nav_on_05.gif)';

}