$('#wheel_width').change(function()
{
    alert("Hello");
});


function showSubmit()
{
    $('#submit_wheels_search').attr('disabled', false);
    $('#submit_wheels_search').css('visibility', 'visible');
}

function hideSubmit()
{
    $('#submit_wheels_search').attr('disabled', true);
    $('#submit_wheels_search').css('visibility', 'hidden');
}

function showHideSubmit()
{
    width  = document.getElementById('wheel_width').value;
    height = document.getElementById('wheel_height').value;
    diameter = document.getElementById('wheel_diameter').value;
    type = document.getElementById('wheel_type').value;
    city = document.getElementById('wheel_city').value;
    
    if(width != '' && height != '' && diameter != '' && type != '' && city != '')
    {
        showSubmit();
    }
    else
    {
        hideSubmit();
    }
}