//var x;

function tab()
{
	if (document.getElementById("444").style.display='block')
	{
		document.getElementById("6666").style.display='none';
		document.images["a"].src="images/features-1.gif";// key active image
	}
	if (document.getElementById("6666").style.display='none')
	{
		document.images["b"].src="images/description-2.gif"; //desc unactive image
	}
	
}
function tab1()
{

	if (document.getElementById("6666").style.display='block')
	{
		document.getElementById("444").style.display='none';
		document.images["b"].src="images/description-1.gif"; //desc active image
	}
	
	if (document.getElementById("444").style.display='none')
	{
		document.images["a"].src="images/features-2.gif"; //key unactive image
	}
}