var timeout;
var name = navigator.appName;

function scroll_up() 
{
	if (name == "Microsoft Internet Explorer")
	{
		if ( top.main.layMain.style.posTop <= 50 ) {
			top.main.layMain.style.posTop += 15;
		}
	}
	else
	{
		NetLayer = top.main.document.layers['layMain'];
		if ( NetLayer.top <= 50 ) {
			NetLayer.top += 15;
		}
	}
	timeout = setTimeout( "scroll_up()", 50 );
}

function scroll_down() 
{
	if (name == "Microsoft Internet Explorer")
	{
		top.main.layMain.style.posTop -= 15;
	}
	else
	{
		NetLayer = top.main.document.layers['layMain'];
		NetLayer.top -= 15;
	}
	timeout = setTimeout( "scroll_down()", 50 );
}

function stop()
{
	clearTimeout( timeout );
}