// not animated collapse/expand
function togglePannelStatus(content)
{
    var expand = (content.style.display=="none");
    content.style.display = (expand ? "block" : "none");
    toggleChevronIcon(content);
}

// current animated collapsible panel content
var currentContent = null;

function togglePannelAnimatedStatus(interval, step)
{ 
var content=document.getElementById('AdvancedSearchBlock');
    // wait for another animated expand/collapse action to end
    if (currentContent==null)
    {
      currentContent = content;
      //  currentContent = content;
        var expand = (content.style.display=="none");
        if (expand)
        {    
        
         
          
            content.style.display = "block";
            
             if(document.getElementById("ctl00_ContentPlaceHolder1_hdnPanelStatus")!=null)
                document.getElementById("ctl00_ContentPlaceHolder1_hdnPanelStatus").value="Show";
            }
            else
            { 
            if(document.getElementById("ctl00_ContentPlaceHolder1_hdnPanelStatus")!=null)
            document.getElementById("ctl00_ContentPlaceHolder1_hdnPanelStatus").value="Hide";
            
            }
        var max_height = content.offsetHeight;

        var step_height = step + (expand ? 0 : -max_height);

        toggleChevronIcon(content);
                
        // schedule first animated collapse/expand event
        content.style.height = Math.abs(step_height) + "px";
       
        setTimeout("togglePannelAnimatingStatus(" + interval + "," + step
            + "," + max_height + "," + step_height + ")", interval);
    }
}

function togglePannelAnimatingStatus(interval, step, max_height, step_height)
{
    var step_height_abs = Math.abs(step_height);

    // schedule next animated collapse/expand event
    if (step_height_abs>=step && step_height_abs<=(max_height-step))
    {
        step_height += step;
        currentContent.style.height = Math.abs(step_height) + "px";
        setTimeout("togglePannelAnimatingStatus(" + interval + "," + step
            + "," + max_height + "," + step_height + ")", interval);
    }
    // animated expand/collapse done
    else
    {
        if (step_height_abs<step)
            currentContent.style.display = "none";
        currentContent.style.height = "";
        currentContent = null;
    }
}

// change chevron icon into either collapse or expand

function toggleChevronIcon(content)
{
   
    var chevron =document.getElementById('ctl00_ContentPlaceHolder1_imgShowHide');
    var expand = document.getElementById("lblAdvanceHeader").innerHTML=="Hide";
    if(expand)
    {
       document.getElementById("lblAdvanceHeader").innerHTML="Show";
       if(document.getElementById("ctl00_ContentPlaceHolder1_hdnTabNo")!=null)
                document.getElementById("ctl00_ContentPlaceHolder1_hdnTabNo").value="";
       }
    else 
       document.getElementById("lblAdvanceHeader").innerHTML="Hide";
chevron.src = chevron.src
        .split(expand ? "HideSearch.jpg" : "showSearch.GIF")
        .join(expand ? "showSearch.GIF" : "HideSearch.jpg");
}