// regular expressions or function to validate the format
var re_dt_lst  = {'d-m-Y' : /^(\d{1,2})\-(\d{1,2})\-(\d{4})$/,
                  'd/m/Y' : /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/,
			      'm-d-Y' : /^(\d{1,2})\-(\d{1,2})\-(\d{4})$/,
                  'm/d/Y' : /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/
			     },
re_tm = /^(\d{1,2})\:(\d{1,2})\:(\d{1,2})$/,
a_formats = {
    'notblank' :/\S/,      
	'alpha'   : /^[a-zA-Z\.\-\s\,\/]*$/,
	'alphanum'   : /^[a-zA-Z\d\.\-\s\,\/]*$/,
	//'alphanum': /^\w+$/,
	'unsigned': /^\d+$/,
	'integer' : /^[\+\-]?\d*$/,
	'real'    : /^[\+\-]?\d*\.?\d*$/,
	'email'   : /^[\w-\.]+\@[\w\.-]+\.[a-z]{2,4}$/,
	'phone'   : /^[\d\.\s\-]+$/,
	'date'    : function (s_date,s_fmt) {
		// check format
		if(s_fmt==undefined || s_fmt==null || s_fmt==""){
		 s_fmt='m-d-Y';//default
		}
		
		re_dt=re_dt_lst[s_fmt];
		if (!re_dt.test(s_date))
			return false;
		// check allowed ranges
		switch(s_fmt){
		 case "d/m/Y":
		 case "d-m-Y":
		  if (RegExp.$1 > 31 || RegExp.$2 > 12)
			return false;
		  // check number of day in month
		  var dt_test = new Date(RegExp.$3, Number(RegExp.$2-1), RegExp.$1);
		  if (dt_test.getMonth() != Number(RegExp.$2-1))
			return false;		  
		  break;
		 case "m/d/Y":
		 case "m-d-Y":
		  if (RegExp.$2 > 31 || RegExp.$1 > 12)
			return false;
		  // check number of day in month
		  var dt_test = new Date(RegExp.$3, Number(RegExp.$1-1), RegExp.$2);
		  if (dt_test.getMonth() != Number(RegExp.$1-1))
			return false;		  
		  break;   
		}		
		return true;
	},
	'time'    : function validate_time(s_time) {
		// check format
		if (!re_tm.test(s_time))
			return false;
		// check allowed ranges	
		if (RegExp.$1 > 23 || RegExp.$2 > 59 || RegExp.$3 > 59)
			return false;
		return true;
	}
},
a_messages = [
	'Warning : No form name passed to validator construction routine',
	'Warning : No array of %form% form fields passed to validator construction routine',
	'Warning : Form %form% can not be found in this document',
	'Warning : Incomplete %n% form field descriptor entry. "l" attribute is missing',
	'Warning : Can not find form field %n% in the form %form%',
	'Warning : Can not find label tag (id="%t%")',
	'Warning : Can not verify match. Field %m% was not found',
	'Alert : %l% is a required field',
	'Alert : Value for %l% must be %mn% characters or more',
	'Alert : Value for %l% must be no longer than %mx% characters',
	'Alert : %v% is not valid value for %l%',
	'Alert : %l% must match %ml%'
]

// validator counstruction routine
function validator(s_form, a_fields, o_cfg) { 
    //for(i in a_fields){
	  //alert(i);
	//}   
	this.f_error = validator_error;
	this.f_alert = o_cfg && o_cfg.alert
		? function(s_msg) { alert(s_msg); return false }
		: function() { return false };
		
	// check required parameters
	if (!s_form)	
		return this.f_alert(this.f_error(0));
	this.s_form = s_form;
	
	if (!a_fields || typeof(a_fields) != 'object')
		return this.f_alert(this.f_error(1));
	this.a_fields = a_fields;

	this.a_2disable = o_cfg && o_cfg['to_disable'] && typeof(o_cfg['to_disable']) == 'object'
		? o_cfg['to_disable']
		: [];
		
	this.exec = validator_exec;
}

// validator execution method
function validator_exec(ext_msg,ext_obj) {	
    this.ext_msg=(ext_msg!=null || ext_msg!=undefined)?ext_msg:"";
	this.ext_obj=(ext_obj!=null || ext_obj!=undefined)?ext_obj:null;
    
	var o_form = document.forms[this.s_form];
	if (!o_form)	
		return this.f_alert(this.f_error(2));
		
	b_dom = document.body && document.body.innerHTML;
		
	
	// check integrity of the form fields description structure
	for (var n_key in this.a_fields) {
		// check input description entry
		this.a_fields[n_key]['n'] = n_key;
		if (!this.a_fields[n_key]['l'])
			return this.f_alert(this.f_error(3, this.a_fields[n_key]));
		o_input = o_form.elements[n_key];
		if (!o_input)
			return this.f_alert(this.f_error(4, this.a_fields[n_key]));
		this.a_fields[n_key].o_input = o_input;
	}

	// reset labels highlight
	if (b_dom)
		for (var n_key in this.a_fields) 		    
			if (this.a_fields[n_key]['t']) {
				var s_labeltag = this.a_fields[n_key]['t'], e_labeltag = get_element(s_labeltag);
				if (!e_labeltag)
					return this.f_alert(this.f_error(5, this.a_fields[n_key]));
				this.a_fields[n_key].o_tag = e_labeltag;
				
				// normal state parameters assigned here				
				e_labeltag.className = 'Normal';
			}else{
			  try{
				 o_form.elements[n_key].className="Normal";				
			  }catch(x){				  
			  }					
			}

	// collect values depending on the type of the input
	for (var n_key in this.a_fields) {
		var s_value = '';
		o_input = this.a_fields[n_key].o_input;
		if (o_input.type == 'checkbox') // checkbox
			s_value = o_input.checked ? o_input.value : '';
		else if (o_input.value) // text, password, hidden
			s_value = o_input.value;
		else if (o_input.options) // select
			s_value = o_input.selectedIndex > -1
				? o_input.options[o_input.selectedIndex].value
				: null;
		else if (o_input.length > 0) // radiobuton
			for (var n_index = 0; n_index < o_input.length; n_index++)
				if (o_input[n_index].checked) {
					s_value = o_input[n_index].value;
					break;
				}
		this.a_fields[n_key]['v'] = s_value.replace(/(^\s+)|(\s+$)/g, '');
	}
	
	// check for errors
	var n_errors_count = 0,
		n_another, o_format_check;
	
	for (var n_key in this.a_fields) {			
		o_format_check = this.a_fields[n_key]['f'] && a_formats[this.a_fields[n_key]['f']]
			? a_formats[this.a_fields[n_key]['f']]
			: null;

		// reset previous error if any
		this.a_fields[n_key].n_error = null;

		// check reqired fields
		if (this.a_fields[n_key]['r'] && !this.a_fields[n_key]['v']) {
			this.a_fields[n_key].n_error = 1;
			n_errors_count++;
		}
		// check length
		else if (this.a_fields[n_key]['mn'] && String(this.a_fields[n_key]['v']).length < this.a_fields[n_key]['mn']) {
			this.a_fields[n_key].n_error = 2;
			n_errors_count++;
		}
		else if (this.a_fields[n_key]['mx'] && String(this.a_fields[n_key]['v']).length > this.a_fields[n_key]['mx']) {
			this.a_fields[n_key].n_error = 3;
			n_errors_count++;
		}
		// check format
		else if (this.a_fields[n_key]['v'] && this.a_fields[n_key]['f'] && (
			(typeof(o_format_check) == 'function'
			&& !o_format_check(this.a_fields[n_key]['v'],this.a_fields[n_key]['df']))
			|| (typeof(o_format_check) != 'function'
			&& !o_format_check.test(this.a_fields[n_key]['v'])))
			) {
			this.a_fields[n_key].n_error = 4;
			n_errors_count++;
		}
		// check match	
		else if (this.a_fields[n_key]['m']) {
			for (var n_key2 in this.a_fields)
				if (n_key2 == this.a_fields[n_key]['m']) {
					n_another = n_key2;
					break;
				}
			if (n_another == null)
				return this.f_alert(this.f_error(6, this.a_fields[n_key]));
			if (this.a_fields[n_another]['v'] != this.a_fields[n_key]['v']) {
				this.a_fields[n_key]['ml'] = this.a_fields[n_another]['l'];
				this.a_fields[n_key].n_error = 5;
				n_errors_count++;
			}
		}
		
	}

	// collect error messages and highlight captions for errorneous fields
	var s_alert_message = '',	    
		e_first_error; 		
	if(this.ext_msg!="")
	  n_errors_count++;	
	if (n_errors_count) {		  
		for (var n_key in this.a_fields) {
			var n_error_type = this.a_fields[n_key].n_error,
				s_message = '';
				
			if (n_error_type)
				s_message = this.f_error(n_error_type + 6, this.a_fields[n_key]);

			if (s_message) {
				if (!e_first_error)
					e_first_error = o_form.elements[n_key];
				    s_alert_message += s_message + "\n";
				// highlighted state parameters assigned here
				
				if (b_dom && this.a_fields[n_key].o_tag){
					this.a_fields[n_key].o_tag.className = 'Highlight';
				}else{
			      try{
				    o_form.elements[n_key].className='Highlight';				
			      }catch(x){}					
			    }
			}
		}
		if(e_first_error==undefined && this.ext_obj!=null){
		  e_first_error=this.ext_obj[0];			  
	    }		
		
		if(this.ext_obj!=null){
		  try{
			 for(key in this.ext_obj){ 			  
			   this.ext_obj[key].className='Highlight';		
			 }
		  }catch(x){}	
		}
		
		s_alert_message+=this.ext_msg;
		alert(s_alert_message);
		
		
		// set focus to first errorneous field		
		if(e_first_error!=undefined){
		  if (e_first_error.focus && e_first_error.type != 'hidden'  && !e_first_error.disabled)
			eval("e_first_error.focus()");
		}	
		// cancel form submission if errors detected
		return false;
	}
	
	for (n_key in this.a_2disable)
		if (o_form.elements[this.a_2disable[n_key]])
			o_form.elements[this.a_2disable[n_key]].disabled = true;

	return true;
}

function validator_error(n_index) {
	var s_ = a_messages[n_index], n_i = 1, s_key;
	for (; n_i < arguments.length; n_i ++)
		for (s_key in arguments[n_i])
			s_ = s_.replace('%' + s_key + '%', arguments[n_i][s_key]);
	s_ = s_.replace('%form%', this.s_form);
	return s_
}

function get_element (s_id) {
	return (document.all ? document.all[s_id] : (document.getElementById ? document.getElementById(s_id) : null));
}