function showProcessing()
{
    darkenPage();
    showProcessingPanel();
}

function showProcessingPanel()
{
    var processing_panel = document.getElementById('processing_panel');
	var theBody          = document.getElementsByTagName('body');

	processing_panel.style.left        = "50%";
	processing_panel.style.marginLeft  = "-75px";
	processing_panel.style.top         = "50%";
	processing_panel.style.marginTop   = "-25px";
	processing_panel.style.display     = "block";
	//theBody.style.overflow    		   = "auto";
}

function hideProcessingPanel()
{
    var processing_panel = document.getElementById('processing_panel');
    processing_panel.style.display = 'none';

    lightenPage();
}


function darkenPage()
{
    var page_screen = document.getElementById('page_screen');
    page_screen.style.height = document.body.parentNode.scrollHeight + 'px';
    page_screen.style.display = 'block';
}


function lightenPage()
{
    var page_screen = document.getElementById('page_screen');
    page_screen.style.display = 'none';
}