var ebRand = Math.random()+''; 
ebRand = ebRand * 1000000; 

document.write('<scr'+'ipt src="HTTP://bs.serving-sys.com/BurstingPipe/ActivityServer.bs?cn=as&amp;ActivityID=' + activityId + '&amp;rnd=' + ebRand + '"></scr' + 'ipt>');