// output error message if validation fails
function _onError(err_message)
{
	alert(err_message);
	return false;	
}

// check form object type for value
function _hasValue(obj, obj_type)
{
	if (obj_type == "TEXT" || obj_type == "PASSWORD")
	{
		if (obj.value.length == 0) 
	  		return false;
		else 
	  		return true;
	}
	else if (obj_type == "SELECT")
	{
		for (i=0; i < obj.length; i++)
		{
			if (obj.options[i].selected)
				return true;
		}
	   	return false;	
	}
	else if (obj_type == "SINGLE_VALUE_RADIO" || obj_type == "SINGLE_VALUE_CHECKBOX")
	{
		if (obj.checked)
			return true;
		else
	   		return false;	
	}
	else if (obj_type == "RADIO" || obj_type == "CHECKBOX")
	{
		for (i=0; i < obj.length; i++)
		{
			if (obj[i].checked)
				return true;
		}
	   	return false;	
	}
	else if (obj_type == "EMAIL")
	{
	  var emailStr = obj.value;
		if(emailStr == "") 
		{ 
			 //	 alert( "Please fill in the 'Email Address'." ); 
		   return false; 
		} 
		var checkTLD=0; 
		var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/; 
		var emailPat=/^(.+)@(.+)$/; 
		var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]"; 
		var validChars="\[^\\s" + specialChars + "\]"; 
		var quotedUser="(\"[^\"]*\")"; 
		var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/; 
		var atom=validChars + '+'; 
		var word="(" + atom + "|" + quotedUser + ")"; 
		var userPat=new RegExp("^" + word + "(\\." + word + ")*$"); 
		var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$"); 
		var matchArray=emailStr.match(emailPat); 
		if (matchArray==null) { 
			//	alert("The Email Address Is Invalid"); 
			return false; 
		} 
		var user=matchArray[1]; 
		var domain=matchArray[2]; 
		for (i=0; i<user.length; i++) { 
		if (user.charCodeAt(i)>127) { 
			//	alert("The Username Contains Invalid Characters."); 
			return false; 
		} 
		} 
		for (i=0; i<domain.length; i++) { 
		if (domain.charCodeAt(i)>127) { 
			//	alert("Ths Domain Name Contains Invalid Characters."); 
			return false; 
		 } 
		} 
		if (user.match(userPat)==null) { 
			//	alert("The Username Is Invalid."); 
			return false; 
		} 
		var IPArray=domain.match(ipDomainPat); 
		if (IPArray!=null) { 
		for (var i=1;i<=4;i++) { 
		if (IPArray[i]>255) { 
			//	alert("The Destination IP Address Is Invalid."); 
			return false; 
		 } 
		} 
			return true; 
		} 
		var atomPat=new RegExp("^" + atom + "$"); 
		var domArr=domain.split("."); 
		var len=domArr.length; 
		for (i=0;i<len;i++) { 
		if (domArr[i].search(atomPat)==-1) { 
			//	alert("The Domain Name Is Invalid."); 
			return false; 
		 } 
		} 
		if (checkTLD && domArr[domArr.length-1].length!=2 && 
		domArr[domArr.length-1].search(knownDomsPat)==-1) { 
			//	alert("The Domain Name Extension Is Invalid"); 
			return false; 
		} 
		if (len<2) { 
			//	alert("The Address Is Missing A Hostname."); 
			return false; 
		} 
		// got this far, is good
		return true;
	}	
}