function checkForm( form, notfocus )
{
	for( var i=0; i<form.elements.length; i++ )
	{
		var element = form.elements[i];
		var elementValue = trim(element.value);
		if( element.tagName.toLowerCase() == "fieldset" )
			continue;
		if( element.type == "text" || element.type == "hidden" || element.type == "password"
					|| element.tagName.toLowerCase() == "textarea" || element.type.indexOf( "select" ) != -1 )
		{
			var errmsg = element.getAttribute( "errmsg" );
			if( errmsg == null )
			{
				var label = element.getAttribute("label");
				if(!label)
					label = element.name;
				errmsg = "Please enter " + label + ".";
			}
			if( elementValue == "" && element.getAttribute( "nullable" ) != "false" )
				continue;
			if( element.getAttribute( "nullable" ) == "false" && elementValue == "" )
			{
				if(element.offsetWidth==0)
					continue;
				//pre requirement
				var pre = element.getAttribute( "pre" );
				if( pre )
				{
					var eindex = pre.indexOf( "=" );
					var eobj = eval(pre.substring(0,eindex));
					var evalue;
					if( eobj.length > 0 && eobj[0].type == "radio" )
					{
						for( var tmpi=0; tmpi<eobj.length; tmpi++ )
						{
							if( eobj[tmpi].checked )
							{
								evalue = eobj[tmpi].value;
								break;
							}
						}
					}
					if(evalue != pre.substring( eindex + 1 ) )
						continue;
				}
				alert( errmsg );
				if( !notfocus )
				{
					element.focus();
				}
				return false;
			}
			if( element.getAttribute( "minlength" ) )
			{
				var minlength = parseInt( element.getAttribute( "minlength" ), 10 );
				if( elementValue.length < minlength )
				{
					alert( errmsg );
					if( !notfocus )
					{
						element.focus();
					}
					return false;
				}
			}
			if( element.getAttribute( "maxlength" ) )
			{
				var maxlength = parseInt( element.getAttribute( "maxlength" ), 10 );
				if( elementValue.length > maxlength )
				{
					alert( errmsg );
					if( !notfocus )
					{
						element.focus();
					}
					return false;
				}
			}
			if( element.getAttribute( "dataType" ) == "email" )
			{
				if( !checkEmail( elementValue ) )
				{
					alert( errmsg );
					if( !notfocus )
					{
						element.focus();
					}
					return false;
				}
			}
			if( element.getAttribute( "dataType" ) == "emails" )
			{
				var emailArray = elementValue.split( "," );
				for( var j=0; j<emailArray.length; j++ )
				{
					if( !checkEmail( emailArray[j] ) )
					{
						alert( errmsg );
						if( !notfocus )
						{
							element.focus();
						}
						return false;
					}
				}
			}
		  else if( element.getAttribute( "dataType" ) == "int" )
		  {
		  	if( !checkDecimalDigits( elementValue ) )
				{
					alert( errmsg );
					if( !notfocus )
					{
						element.focus();
					}
					return false;
				}
		  }
			else if( element.getAttribute( "dataType" ) == "double" )
			{
				if( elementValue.indexOf( "/" ) != -1 )
				{
					var index = elementValue.indexOf( " " );
					var avalue = trim(elementValue.substring(0,index));
					var bvalue = eval(trim(elementValue.substring(index)));
					if(avalue=="")
						avalue = 0;
					else
						avalue = parseInt(avalue,10);
					elementValue = avalue + parseFloat(bvalue);
					elementValue = Math.round(elementValue*10) / 10;
					element.value = elementValue;
				}
				var re = /^\d+(\.\d+)?$/;
				var match = re.test( elementValue );
				if( !match )
				{
					alert( errmsg );
					if( !notfocus )
					{
						element.focus();
					}
					return false;
				}
			}
			
			//check restrict
			var dataType = element.getAttribute( "dataType" )
			var scope = element.getAttribute( "scope" );
			var rvalue = parseFloat( element.value );
			if( scope && ( dataType == "int" || dataType == "double" ) )
			{
				scope = trim( scope );
				var index = scope.indexOf( "," );
				if( index != -1 )
				{
					var beginValue = parseFloat( scope.substring( 1, index ) );
					var endValue = parseFloat( scope.substring( index + 1, scope.length -1 ) );
					if( !beginValue )
						beginValue = number.MIN_VALUE;
					if( !endValue )
						endValue = number.MAX_VALUE;
					if( rvalue < beginValue || rvalue > endValue )
					{
						alert( errmsg );
						if( !notfocus )
						{
							element.focus();
						}
						return false;
					}
				}
			}
		}
		else if( element.type == "checkbox" || element.type == "radio" )
		{
			if( element.getAttribute( "nullable" ) == "false" )
			{
				var isChecked = false;
				for( var j=0; j<form.elements.length; j++ )
				{					
					if( form.elements[j].getAttribute( "name" ) == element.getAttribute( "name" ) )
					{
						if( form.elements[j].getAttribute( "errmsg" ) )
							errmsg = form.elements[j].getAttribute( "errmsg" );
						if( form.elements[j].checked )
						{
							isChecked = true;
							break;
						}
					}
				}
				if( !isChecked )
				{
					if( errmsg == null )
					{
						var label = element.getAttribute("label");
						if(!label)
							label = element.name;
						errmsg = "Please select " + label + ".";
					}
					alert( errmsg );
					if( !notfocus )
					{
						element.focus();
					}
					return false;
				}
			}
		}
	}
	return true;
}

function trim( val )
{
	if( !val )
		val = "";
	var re = /^\s*/;
	val = val.replace( re, "" );
	
	re = /\s*$/;
	val = val.replace( re, "" );
	return val;
}

function isHidden( obj )
{
	return obj.style.display == "none";
}
function checkEmail(emailStr) 
{
  if (emailStr.length == 0) 
  {
      return false;
  }
  // TLD checking turned off by default
  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 +")*$");
  var matchArray=emailStr.match(emailPat);
  if (matchArray==null) {
      return false;
  }
  var user=matchArray[1];
  var domain=matchArray[2];
  for (i=0; i<user.length; i++) {
      if (user.charCodeAt(i)>127) {
          return false;
      }
  }
  for (i=0; i<domain.length; i++) {
      if (domain.charCodeAt(i)>127) {
          return false;
      }
  }
  if (user.match(userPat)==null) {
      return false;
  }
  var IPArray=domain.match(ipDomainPat);
  if (IPArray!=null) {
      for (var i=1;i<=4;i++) {
          if (IPArray[i]>255) {
              return false;
          }
      }
      return true;
  }
  var atomPat=new RegExp("^" + atom + "$");
  var domArr=domain.split(".");
  var len=domArr.length;
  for (i=0;i<len;i++) {
      if (domArr[i].search(atomPat)==-1) {
          return false;
      }
  }
  if (checkTLD && domArr[domArr.length-1].length!=2 && 
      domArr[domArr.length-1].search(knownDomsPat)==-1) {
      return false;
  }
  if (len<2) {
      return false;
  }
  return true;
}

function checkDecimalDigits(argvalue) 
{
  argvalue = argvalue.toString();
  var validChars = "0123456789";
  var startFrom = 0;
  if (argvalue.charAt(0) == "-") 
  {
  	startFrom = 1;
  }
  for (var n = startFrom; n < argvalue.length; n++)
  {
  	if (validChars.indexOf(argvalue.substring(n, n+1)) == -1) return false;
  }
  return true;
}