function showProducts()
{
    var current_color = document.product.current_color.value;
    var id = document.product.color_id.value;
    div_block = 'color_'+id;
    document.getElementById(div_block).style.display = 'block';
    document.product.current_color.value = id;
    div_hidden = 'color_'+current_color;
    document.getElementById(div_hidden).style.display = 'none';
    
}