var previousObj;


function setVisible(obj){
	obj1 = document.getElementById(obj);
	
	/* hide previous div */
	if (typeof previousObj != "undefined"){
		previousObj.style.visibility = "hidden";
	}
	else{
		document.getElementById('INTRO').style.visibility = "hidden";
	}

	/* show new div */
	obj1.style.visibility = "visible";
	previousObj = obj1;
	

	var sidemenuHeight = document.getElementById('contentLeft').offsetHeight;
	var newDivHeight = obj1.offsetHeight;
	var mainHeight = document.getElementById('contentRight').offsetHeight;
	//alert("1:" + sidemenuHeight + "   2:" + newDivHeight); 
	
	var newHeight = Math.max(sidemenuHeight, newDivHeight);
	newHeight = newHeight + 20;
	document.getElementById('contentRight').style.height = newHeight +'px';
	var mainHeight = document.getElementById('contentRight').offsetHeight;
}