window.onload=function(){

	var mainDiv, sidebarDiv, sidebarLastDiv, mainDivHeight, sidebarLastDivHeight, sidebarDivHeight, maxHeight;

	mainDiv=document.getElementById("gbt-main");

	sidebarDiv=document.getElementById("gbt-sidebar");

	sidebarLastDiv=document.getElementById("gbt-side-panel-last");

	// determine height for <div> element

	if(mainDiv.offsetHeight){

		mainDivHeight=mainDiv.offsetHeight;

		sidebarLastDivHeight=sidebarLastDiv.offsetHeight;

		sidebarDivHeight=sidebarDiv.offsetHeight;

	}

	else if(main-div.style.pixelHeight){

		mainDivHeight=mainDiv.style.pixelHeight;;

		sidebarLastDivHeight=sidebarLastDiv.style.pixelHeight;

		sidebarDivHeight=sidebarDiv.offsetHeight;

	}

	// set height for last div in sidebar to make the sidebar the same height as the main div

	if(sidebarDivHeight < mainDivHeight){
		maxHeight = mainDivHeight - sidebarDivHeight + sidebarLastDivHeight;
		sidebarLastDiv.style.height = maxHeight + 'px';
	}

 }