var _mainDiv;
var _postingDiv;
var _thankYouDiv;

function pageLoad(sender, args){    
    //  register for events
    Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginRequest);
    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequest);    
    
    _mainDiv = $get('gplMain');
    _postingDiv = $get('gplPosting');
    _thankYouDiv = $get('gplThankYou');
}        

function beginRequest(sender, args){
    
    //make main div invisible
    _mainDiv.style.display = 'none';
    
    // make posting div visible
    _postingDiv.style.display = '';
}

function endRequest(sender, args) {

    //make main div invisible
    _mainDiv.style.display = 'none';
    
    // make posting div invisible
    _postingDiv.style.display = 'none';
    
    //make thankyou div visible
    _thankYouDiv.style.display = '';
}