Main = new function ()
{
	
	this.execute = function()
	{
	set_navigation_tabs();
	}
	
	function set_navigation_tabs ()
	{
	var m_p = document.getElementById('main_menu').getElementsByTagName('li');

		for ( var p=0; p < m_p.length ; p++)
		{
			var p_ul = m_p[p].getElementsByTagName('ul');
			if( m_p[p].className=="sub")// p_ul.length > 0)
			{   
				var temp_id = p_ul[0].id;
				m_p[p].onmouseover = function (){this.getElementsByTagName('ul')[0].style.display="block";}
				m_p[p].onmouseout =  function (){this.getElementsByTagName('ul')[0].style.display="none";}
			} 
		}
	}

	
}