oldtab1 = 1;

function tabOpen1(tabnum) {

	document.getElementById('tab1'+oldtab1).className = "tabOFF";
	document.getElementById('tab1'+oldtab1+'text').className = "tabOFFtext2";
	document.getElementById('tab1'+tabnum).className = "tabON";
	document.getElementById('tab1'+tabnum+'text').className = "tabONtext2";
	document.getElementById('forecast'+oldtab1).style.display = "none";
	oldtab1 = tabnum;
	document.getElementById('forecast'+tabnum).style.display = "block";

}