function submit_form(lang) {	
	var fields = new Array('msg_name', 'msg_mail', 'msg_subject', 'msg_content', 'msg_anti_spam');
	var error = false;
	
	var count = fields.length;
	for ( var i=0; i<count; i++ ) {
		check = $(fields[i]);
		
		check.value = check.value.replace(/^\s+|\s+$/g,"");
		if ( check.value == '' || check.value == ' ' ) {
			check.parentNode.parentNode.className = 'error';
			error = true;
		} else {
			check.parentNode.parentNode.removeAttribute('class');
		}
	}
	
	
	if($('msg_anti_spam').value == '')
	{
		error = true;
		if( lang == 'bg' )
		{
			alert("Въведете контролен низ!");
		}
		
		if( lang == 'en' )
		{
			alert("Please enter control string!");
		}
	}
	
	if (!error) {
		$('contact_form').submit();
	}
}