GetElementById is not a function?

Question

When running this script i get an error message that document.GetElementById is not a function?? - You can see the site at: http://www.fritidsjobbere.dk:

//Show random div with Javascript
antal = 6;
var randomnumber=Math.floor(Math.random()*antal);
if(randomnumber == "0") {
randomnumber = 1;
}
//alert(randomnumber);
document.getElementsById("partner-ad"+randomnumber).style.display = 'block'; 

Answer 1

getElementsById -> getElementById