function check_form( form ){
	if ( form && ( l = form.elements.length )){
		for ( i = 0; i < l; ++ i ){
			if ( form.elements[ i ].value == '' && form.elements[ i ].type != 'hidden' && ( form.elements[ i ].title == 'mandatory' || form.elements[ i ].title == 'email' )){
				alert( 'Field is empty !' );
				form.elements[ i ].focus();
				return false;
			}
			if ( form.elements[ i ].title == 'email' && form.elements[ i ].value.search( /\w+@[\w\-]+\.\w{2,3}/ ) == -1 ){
				alert( 'E-mail is incorrect!' );
				form.elements[ i ].focus();
				form.elements[ i ].value = form.elements[ i ].value;
				return false;	
			}
		}
	}
	return true;
}