function ToggleMainTab(elId,setting) {
	var myObj;
	if (myObj=document.getElementById(elId)) myObj.style.display=setting;
}

opentab="home";

function ClickTab(which) {
	ToggleMainTab(opentab,'none');
	ToggleMainTab(which+"off",'none');
	ToggleMainTab(opentab+"on",'none');
	
	ToggleMainTab(opentab+"off",'block');
	ToggleMainTab(which+"on",'block');
	ToggleMainTab(which,'block');

	opentab=which;
}