var creature = new Array();
creature[0] = 'cr_01';
creature[1] = 'cr_02';
creature[2] = 'cr_03';
creature[3] = 'cr_04';
creature[4] = 'cr_05';
creature[5] = 'cr_06';
creature[6] = 'cr_07';
creature[7] = 'cr_08';
creature[8] = 'cr_09';

function ranCreature() {
	var ranNum = Math.round(Math.random()*8);
	var crSource = '<img src="images/' + creature[ranNum] + '.jpg" width="350" height="270" border="0" alt="">';
	return crSource;
}
var tmpStr = '';
tmpStr += '<div id="orc">' + ranCreature() + '</div>';
document.write(tmpStr);