var activeTab = "sun";
var activeCopy = "sun_display";

function changeTab(divTab,_link) 
{
	var el = document.getElementById(divTab);
	el.className = "tab_open";
	//_link.className = "tab_open";
	
	var activeEl = document.getElementById(activeTab);
	activeEl.className = "tab_closed";
	activeTab = divTab;
	
	/* show/hide content */
	var copyEl = document.getElementById(divTab + "_display").style;
	copyEl.display = "block";
	
	var activeCopyEl = document.getElementById(activeCopy).style;
	activeCopyEl.display = "none";
	
	activeCopy = divTab + "_display";

}

function showBlock(elemId)
{
	var el = document.getElementById(elemId).style;
	el.display = "block";
}

function hideBlock(elemId)
{
	var el = document.getElementById(elemId).style;
	el.display = "none";
}