function isEmpty(s)
{
	return((s==null)||(s.length==0))
}

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

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

var DEOK=false;

function isEmail(s)
{
	if(isEmpty(s))
		if(isEmail.arguments.length==1) 
			return DEOK;
		else 
			return(isEmail.arguments[1]==true);
	
	if(isWhitespace(s)) 
		return false;
	
	i=1;
	sLength=s.length;
	
	while((i<sLength) && (s.charAt(i) !="@")){i++};
	
	if((i >=sLength) || (s.charAt(i) !="@")) 
		return false;
	else 
		i +=2;
		
	while((i < sLength) && (s.charAt(i) !=".")){i++};
	
	if((i >=sLength - 1) || (s.charAt(i) !=".")) 
		return false;
	else 
		return true;
}

function validate(ids, names, types)
{
	for(var i = 0; i < ids.length; i++)
	{
		value = document.getElementById(ids[i]).value;
		
		switch(types[i])
		{
			case 'email' :
				if(isEmpty(value))
				{
					alert('The ' +  names[i] + ' is empty.');
					
					return false;
				}
				else if(!isEmail(value))
				{
					alert('The ' +  names[i] + ' is incorrect.');
					
					return false;
				}
	
				break;
			case 'text'  :
				if(isEmpty(value))
				{
					alert('The ' +  names[i] + ' is empty.');
					
					return false;
				}
				
				break;
		}
	}
	
	return true;
}