function validEmail(no)
{
	var warningHeader 				= "The following errors occured:\n\n"
	var startOfWarning				= " + "
	var incompleteWarningStart		= ""
	var incompleteWarningEnd		= " must be completed\n"
	var invalidEmailWarningStart 	= ""
	var invalidEmailWarningEnd 		= " is not a valid email address\n"
	var invalidNumberWarningStart	= ""
	var invalidNumberWarningEnd		= " is not a valid number \n"
	var invalidCheckWarningStart	= " You must choose a value for "
	var invalidCheckWarningEnd		= "\n"
	var displayIncomplete			= ""
	var displayInvalid				= ""
	 var displayName				= "Email"
	
	var elementValue = document.getElementById('email' + no).value;
	
	if (elementValue=="")
	{			
		displayIncomplete += startOfWarning + incompleteWarningStart + displayName + incompleteWarningEnd ;
	}
	else
	{
		var locationAtSymbol 		= elementValue.indexOf("@")
		var locationLastFullStop	= elementValue.lastIndexOf(".")
		if (locationLastFullStop   <= locationAtSymbol)
		{
			displayInvalid += startOfWarning + invalidEmailWarningStart + "'" + elementValue + "'" + invalidEmailWarningEnd ;
		}
	}
	
	if (displayIncomplete.length + displayInvalid.length != 0)
	{
		alert(warningHeader + displayIncomplete + "\n" + displayInvalid) ;
	  	return false ;
	}
	else
	{
	  	return true ;
	}

}
function selectTab(id)
{
	switch(id)
	{
		case 1:
			document.getElementById('mortgage').style.display = 'block';
			document.getElementById('buytolet').style.display = 'none';
		break;
		case 2: 
			document.getElementById('mortgage').style.display = 'none';
			document.getElementById('buytolet').style.display = 'block';
		break;
		default: 
			document.getElementById('mortgage').style.display = 'block';
			document.getElementById('buytolet').style.display = 'none';
	}
}