var explanationShown = false;

function previousOrders_Change()
{
    var previousOrders = $('Master_ContentPlaceHolder_previousOrders');
    var previewCouponLink = $('previewCouponLink');
    var existingCouponLink = $('Master_ContentPlaceHolder_previousCouponText');
    
    previewCouponLink.href = "generated/previews/" + previousOrders.options[previousOrders.selectedIndex].value;
    
    if(previewCouponLink.style.display == 'none')
    {
        previewCouponLink.style.display = 'inline';
    }
    
  new Effect.Highlight(existingCouponLink, {startcolor:'#CCCCCC', endcolor:'#ffff99', restorecolor: 'ffff99'});
}

function previousCoupon_OnMouseOver()
{
    var existingCoupon = $('existingCoupon');
    
    if(explanationShown == false)
    {
        new Effect.Appear(existingCoupon);
        new Effect.Highlight(existingCoupon);
        
        explanationShown = true;
    }
}