today=new Date();
	jran=today.getTime();

	var number=4;

	var random_number=0;

	var image="";


function randomizeNumber()

	{

	ia=9301;

	ic=49297;

	im=233280;

	jran = (jran*ia+ic) %im;

	random_number=Math.ceil( (jran/(im*1.0)) *number);


	if (random_number==1)
	    image="images/random/urban_ground_screen1.jpg";
		
	if (random_number==2)
	    image="images/random/urban_ground_screen2.jpg";
		
	if (random_number==3)
	    image="images/random/urban_ground_screen3.jpg";
		
	if (random_number==4)
	    image="images/random/urban_ground_screen4.jpg";
		
	    
	}

function reloadPage()

	{ window.location="random.html"; }



	randomizeNumber();