How to delay calling of javascript function?

setTimeout is compatible with all browsers since 1996. You should avoid the evaluation of “functionName()” and instead do:

setTimeout(functionName,5000)

UPDATE: If you initially expect a variable passed to the function and none when in the timeout, you need to do this instead:

setTimeout(function() { functionName() },5000)

However you are calling the onload incorrectly, so you need to do either this:

window.addEventListener("load",function() {
  // your stuff
}

or the simpler

window.onload=function() {
  // your stuff
}

or, since you are using jQuery, this:

$(document).ready(function() {
    // your stuff
});

or just this:

$(function() {
    // your stuff
});