// mreg validation functions
function validate_email(field,alerttxt) 
{
	with (field)
	{
		if ((value.indexOf(".") > 2) || (value.indexOf("@") > 0))
		{
			return true;
		}
		else
		{
  			alert(alerttxt);
			return false;
		}
	}
}

function validate_required(field,alerttxt)
{
	with (field)
	{
		if (value==null||value=="")
		{
  			alert(alerttxt);
			return false;
		}
		else 
		{
			return true;
		}
	}
}

function isValid(string,allowed) 
{
   	for (var i=0; i < string.length; i++) 
	{
       	if( allowed.indexOf(string.charAt(i)) == -1 )
		{   
         	 return false;
		}
    }
    return true;
}

function validate_mreg_form(thisform)
{
	with (thisform)
	{
		if (validate_required(email,"Please supply your e-mail address")==false)
		{
			email.focus();
			return false;
		}

		if (validate_email(email,"Please supply a valid e-mail address")==false)
		{
			email.focus();
			return false;
		}

		if (validate_required(pass1,"Please supply a password")==false)
		{
			pass1.focus();
			return false;
		}

		var valid = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; // define valid characters

		if( isValid(pass1.value,valid) == false ) 
		{
			alert("Passwords should contain letters and numbers only");
			pass1.focus();
			return false;
		}

		if (pass1.value != pass2.value)
		{
			alert("The two passwords entered must be the same");
			pass2.focus();
			return false;
		}

		if( !accept.checked ) 
		{
			alert("Please tick the box to confirm that you have read and understood the Ulinx terms and conditions");
			return false;
		}
	}
}