var whitespace="\t\n\r";

function isEmpty(s)
{
	var i;
	if((s==null) || (s.length==0))
		return true;
	for(i=0; i<s.length;i++)
	{
		var c=s.charAt(i);
		if(whitespace.indexOf(c)==-1)
			return false;
	}
	return true;
}

function isEmail(field)
{
	var positionOfAt;
	var s = field.value;
	if(isEmpty(s))
	{
		alert("E-Mail Address can not be empty.");
		field.focus();
		return false;
	}
	positionOfAt = s.indexOf('@',1);
	if((positionOfAt == -1) || (positionOfAt == s.length-1))
	{
		alert("E-Mail Address must contain a '@' and a host name.");
		field.focus();
		return false;
	}
	return true;
}

function validate()
{
	if(!isEmail(document.form.email))
	{
		document.form.email.focus();
		return false;
	}
	return true;
}

function putFocus(formInst, elementInst)
{
	if (document.forms.length > 0)
	{
   		document.forms[formInst].elements[elementInst].focus();
  	}
}