function showhide(divver){
if (divver == 'two') { 
	document.getElementById('mid_sub_in_1').style.display = 'none';
	document.getElementById('more_1').style.display = 'none';
	document.getElementById('more_2').style.display = 'block';
	document.getElementById('mid_sub_in_2').style.display = 'block';
	document.getElementById('tab_1').innerHTML = '<a href="index.php" onclick="return showhide(\'one\');"><img src="images/equity_off.gif" alt="Equity" /></a>';
	document.getElementById('tab_2').innerHTML = '<a href="index.php" onclick="return showhide(\'two\');"><img src="images/fix_on.gif" alt="Fixed Income" /></a>';
} else if (divver == 'one') {
	document.getElementById('mid_sub_in_1').style.display = 'block';
	document.getElementById('mid_sub_in_2').style.display = 'none';
	document.getElementById('more_1').style.display = 'block';
	document.getElementById('more_2').style.display = 'none';
	document.getElementById('tab_1').innerHTML = '<a href="index.php" onclick="return showhide(\'one\');"><img src="images/equity_on.gif" alt="Equity" /></a>';
	document.getElementById('tab_2').innerHTML = '<a href="index.php" onclick="return showhide(\'two\');"><img src="images/fix_off.gif" alt="Fixed Income" /></a>';
} else if (divver == 'four') {
	document.getElementById('col3_sub_in_1').style.display = 'none';
	document.getElementById('col3_sub_in_2').style.display = 'block';
	document.getElementById('col3_tab_1').innerHTML = '<a href="index.php" onclick="return showhide(\'three\');"><img src="images/events_off.gif" alt="Events" /></a>';
	document.getElementById('col3_tab_2').innerHTML = '<a href="index.php" onclick="return showhide(\'four\');"><img src="images/news_on.gif" alt="News" /></a>';
} else if (divver == 'three') {
	document.getElementById('col3_sub_in_1').style.display = 'block';
	document.getElementById('col3_sub_in_2').style.display = 'none';
	document.getElementById('col3_tab_1').innerHTML = '<a href="index.php" onclick="return showhide(\'three\');"><img src="images/events_on.gif" alt="Events" /></a>';
	document.getElementById('col3_tab_2').innerHTML = '<a href="index.php" onclick="return showhide(\'four\');"><img src="images/news_off.gif" alt="News" /></a>';
}

return false;
}

function check_form() {
	var flag = true;
	var invno = document.getElementById('cartId').value;
	var amount = document.getElementById('amount').value;
	var email = document.getElementById('email').value;
	if (invno.length == 0) {
		alert('Please enter the Invoice Number');
		flag = false;
	}
	if (amount.length == 0) {
		alert('Please enter the Invoice Amount');
		flag = false;
	} else {
		var arrParts = amount.split('.');
		var amer = 1;
		if(arrParts.length > 2) {
			amer = 2;
			flag = false;
		}
		if (isNaN(amount)) {
			amer = 2;
			flag = false;
		}
		if (amer == 2) {
			alert('Please check that you have entered the Invoice Amount correctly - the amount may only include numbers and a maximum of one decimal point.');
		}
	}
	if (email.length == 0) {
		alert('Please enter your Email Address');
		flag = false;
	}
	if (email.length >= 1) {
		function val_e(email){
		var regEx = /^[\w\+\\'\.-]+@[\w\\'\.-]+\.[a-zA-Z]{2,}$/;
		var theFlag = regEx.test(email);
		return theFlag;
		}
		var echeck = document.getElementById('email').value;
		var vale = val_e(echeck);
		if (vale == false){
		alert('Your email address doesn\'t seem to be valid! Please check it.');
		flag = false;
		}
	}
	return flag;
}