var Class_Calculator = function(){
}

Class_Calculator.prototype = {
    validate: function(element, min, max)
    {
	    var valid = true;
    	var obj = $(element);
    	
    	obj.parents("tr").find("td:first").removeClass('error');
    	
    	if (obj.val() < min || obj.val() > max)
    	{
    		valid = false;
    	}
 
 		if (!valid)
 		{
	    	obj.parents("tr").find("td:first").addClass('error');
 		}
    }
}

var Calculator = new Class_Calculator();