jQuery Validate img - add method

Create / add a new method:

jQuery.validator.addMethod("imgType", function(value, element) {

var extension = value.substr( (value.lastIndexOf('.') +1) );

    if(extension=='jpg' || extension=='gif' || extension=='png'){

    return true;

}else{

return false;

}

}, "=$this->lang->line('error_img')?>");

rules:{

   inputImg: {required:true,imgType:true}

}