function order_now()
{
    keys = new Object();
    path = 'ordernow-start';
    
    popup_bigger_window_display(path,keys);
}

function calculate_ring_size()
{
    if( xGetElementById('strip-length').value == "" )
    {
        alert("Please enter length of the string!");
        xGetElementById('strip-length').focus();
        return;
    }
    if( !is_numeric(xGetElementById('strip-length').value) )
    {
        alert('Length must be a number!');
        xGetElementById('strip-length').focus();
        return;
    }
    var diameter = (xGetElementById('strip-length').value)/3.14;
    var ring_size = 'none';
    
    if( diameter < 17 )
    {
        ring_size = "Small";
    }
    else
    if( diameter < 19 )
    {
        ring_size = "Medium";
    }
    else
    if( diameter < 21 )
    {
        ring_size = "Large";
    }
    else
    {
        ring_size = "X-Large";
    }
    
    alert("Your ring size is: "+ring_size);
}