function randomnumber(num1,num2)
{
	num1 = parseInt(num1);
	num2 = parseInt(num2);
	var generator = Math.random()*(num2-num1);
	generator = Math.round(num1+generator);
	return generator;
	
}
var prin = randomnumber(1,2);
if(prin == 1)
{
document.write("<center><a href='http://www.oilgae.com/ref/report/digest/digest.html'><img src='http://www.oilgae.com/adv/oa1.gif'></a></center>");
}
else if(prin == 2)
{
document.write("<center><a href='http://www.oilgae.com/ref/report/report.html'><img src='http://www.oilgae.com/adv/oc.gif'></a></center>");
}// JavaScript Document