function showdata(no)
{
	var j;
	var k;
	var i;
	for (i=1; i<7; i++) /* increase the iteration when tabs are increased*/
	{
		if(i == no)
		{
			j = "tab"+no
			k = "tabcontent"+no;
			document.getElementById(j).className="top_linkSel";
			document.getElementById(k).style.display="block"
		}
		else
		{
			j = "tab"+i
			k = "tabcontent"+i;
			document.getElementById(j).className="top_link";
			document.getElementById(k).style.display="none";
		}
	}
}