var delay=15000

var ie4=document.all

var curindex=0

var totalcontent=0



function get_total()

{

	if (ie4)

	{

		while (eval("document.all.content"+totalcontent))

		totalcontent++

	}

	else

	{

		while (document.getElementById("content"+totalcontent))

		totalcontent++

	}

}



function contract_all()

{

	for (y=0;y<totalcontent;y++)

	{

		if (ie4)

		eval("document.all.content"+y).style.display="none"

		else

		document.getElementById("content"+y).style.display="none"

	}

}



function expand_one(which)

{

	contract_all()

	if (ie4)

	eval("document.all.content"+which).style.display=""

	else

	document.getElementById("content"+which).style.display=""

}



function rotate_ad_content()

{

	get_total()

	contract_all()

	expand_one(curindex)

	curindex=(curindex<totalcontent-1)? curindex+1: 0

	setTimeout("rotate_ad_content()",delay)

}