Help with Javascript function to show a hidden button with setTimeout

I have an interactive PDF with a form field button called “Nav_Forward_Page_14” that is set to hidden. I want the button to be visible 5 seconds after the page containing the button loads; so on Page Properties (for the page with the button), I've tried adding the following Javascript on page load, with no success:

setTimeout(function() {

this.getElementById("Nav_Forward_Page_14").style.display = "inline";

}, 5000);

Thinking that I may have the function wrong, I also tried:

setTimeout(function() {

this.getElementById("Nav_Forward_Page_14").display = display.visible;

}, 5000);

After more research, I've also tried:



function runImage() {

this.getField("Nav_Forward_Page_14").display = display.visible

}

run = app.setTimeout("runImage()", 5000);

Please help me correct the function necessary to show the hidden button after a delay on page load in a PDF. Thank you in advance!