function showdiv(id, footer)
	{
	 div = document.getElementById(id);
	 if(div)
		{
		 if(div.style)
			{
			 div.style.visibility = 'visible';
			 if(footer)
				{
				 div.style.display = 'block';
				}
			}
		 else
			{
			 div.visibility = 'show';
			 if(footer)
				{
				 div.display = 'show';
				}
			}	
		}
	}

function hidediv(id, footer)
	{
	 div = document.getElementById(id);
	 if(div)
		{
		 if(div.style)
			{
			 div.style.visibility = 'hidden';
			 if(footer)
				{
				 div.style.display = 'none';
				}
			}
		 else
		 	{
			 div.visibility = 'hide';
			 if(footer)
				{
				 div.style.display = 'hide';
				}
			}
		}
	}

function select(tab)
	{
	 hidediv("link1", 0);
	 hidediv("link2", 0);
	 hidediv("link3", 0);
	 hidediv("link4", 0);
	 hidediv("link5", 0);
	 hidediv("link6", 0);
	 hidediv("link7", 0);
	 hidediv("link8", 0);
	 hidediv("link9", 0);
	 hidediv("link10", 0);
	 hidediv("link11", 0);
	 hidediv("link12", 0);
	 hidediv("link13", 0);
	 hidediv("link14", 0);
	 hidediv("link15", 0);
	 hidediv("link16", 0);
	 hidediv("link17", 0);
	 hidediv("link18", 0);
	 showdiv("link"+tab, 0);
	}
	
function selectFeature(tab)
	{
	 hidediv("feature1", 0);
	 hidediv("feature2", 0);
	 hidediv("feature3", 0);
	 hidediv("feature4", 0);
	 hidediv("feature5", 0);
	 showdiv("feature"+tab, 0);
	}

function selectFooter(tab)
	{
	 hidediv("footer1", 1);
	 hidediv("footer2", 1);
	 showdiv("footer"+tab, 1);
	}