var 		adImg = [],
		adLink = [], 
		adPadding = [],
		adEventCode = [],
		adIndex = 0;

adImg[0] = "http://www.marintecchina.com/portals/39/ad/banner1/images/cruise2011.jpg";
adLink[0] = "http://www.cruiseshippingasia.com";
adPadding[0] = "0px";
adEventCode[0] = "cruise2011_top";

adImg[1] = "http://www.marintecchina.com/portals/39/ad/banner1/images/werbe.jpg";
adLink[1] = "http://www.marintec.german-pavilion.com";
adPadding[1] = "150px";
adEventCode[1] = "werbe_top";

adImg[2] = "http://www.marintecchina.com/portals/39/ad/banner1/images/dnv.gif";
adLink[2] = "";
adPadding[2] = "0px";
adEventCode[2] = "dnv_top";

adImg[3] = "http://www.marintecchina.com/portals/39/ad/banner1/images/futureship.gif";
adLink[3] = "";
adPadding[3] = "0px";
adEventCode[3] = "futureship_top";

adIndex = Math.floor(Math.random() * adImg.length);

if (adLink[adIndex] == "") {
  document.write("<div style='padding-left:" +adPadding[adIndex]+ "'><img src='" +adImg[adIndex]+ "' border='0'></div>");
} else {
  document.write("<div style='padding-left:"+adPadding[adIndex]+"'><a href='"+adLink[adIndex]+"' target='_blank' onclick='myTrackEvent(\"click\",\""+adEventCode[adIndex]+"\");'><img src='"+adImg[adIndex]+"' border='0'></a></div>");
}
myTrackEvent("impression",adEventCode[adIndex]);

function myTrackEvent(inAction, inCampaign) {
  _gaq.push(['_trackEvent', 'Ad', inAction, inCampaign]);
}