Topic awaiting preservation: beginner Jscript IF statement help

I want to have a box appear if it is not there and disappear if it is, triggered by a click.

function sT(){
if (document.getElementById('tB').style.visibility == hidden){
document.getElementById('tB').style.visibility='hidden'
}
else {
document.getElementById('tB').style.visibility='visible';}


this is what I have now.... I have tried EVERYTHING....
My original:

function sT(){
document.getElementById('tB').style.visibility='visible';}

works to make box appear, but that is it.

Thank You for your help!

You are trying to ask "if (document.getElementById('tB').style.visibility == hidden){" where the hidden should be a string and not undefined variable.
you can try the following code (if you dont like the ...style.display... you can modify it to ...style.visibility...):

function sT(){

        InvertState(document.getElementById('tB'));

    }

    

    function InvertState(oElem){

        if(oElem.style.display == 'block'){

            oElem.style.display = 'none'

        } else {

            oElem.style.display = 'block'

        }

    }

I'm sorry I tried that... I eventually get to a point where I don't know what ic could be and I just start changin syntax type things. Like paranethese, commas, etc.

Are the semicolons the problem?

javascript:

function toggleVisibility(item){



    if (document.getElementById(item).style.visibility=='hidden'){

        document.getElementById(item).style.visibility='visible';

    }

    else{

         document.getElementById(item).style.visibility='hidden';

    }

}

HTML:

<div id="toggle" onclick="toggleVisibility('target')">Click to toggle</div>
<br /><br />
<div id="target">Can you see this?</div>

/* Sure, go ahead and code in your fancy IDE. Just remember: it's all fun and games until someone puts an $i out */

Thank you very much norm!!