function clientWidth() {
	 var wwidth=(window.innerWidth)?window.innerWidth:
    	((document.all)?document.body.offsetWidth:null);
	return wwidth;
}

function changeVisibility(objId) {
	object = document.getElementById(objId);
	//alert(object + ' : ' + object.style.display);
	object.style.display = (object.style.display == 'none' || object.style.display == '') ? 'block' : 'none';
	
	return;
}