function center(id,h,v)
{
	try
	{
		var obj = document.getElementById(id);
		if(!obj)
			return;

		if(v)
		{
			if(window.innerHeight)
				var t = (parseInt(window.innerHeight,10) / 2) - (parseInt(obj.offsetHeight,10) / 2);
			else
				var t = (parseInt(document.body.offsetHeight,10) / 2) - (parseInt(obj.offsetHeight,10) / 2);
			obj.style.top = t + "px";
		}
		if(h)
		{
			if(window.innerWidth)
				var l = (parseInt(window.innerWidth,10) / 2) - (parseInt(obj.offsetWidth,10) / 2);
			else
				var l = (parseInt(document.body.offsetWidth,10) / 2) - (parseInt(obj.offsetWidth,10) / 2);
			obj.style.left = l + "px";
		}
	}
	catch(e)
	{}
}

function showHide(id,mode)
{
	try
	{
		var obj = document.getElementById(id);
		if(!obj)
			return;
		switch(mode)
		{
			case -2:
				obj.style.display = 'none';
				break;
			case -1:
				obj.style.visibility = 'hidden';
				break;
			case 1:
				obj.style.visibility = 'visible';
				break;
			case -2:
				obj.style.display = '';
				break;
		}
	}
	catch(e)
	{}
}