Show or hide div with javasript

I am using JavaScript like the below to check an ID. It hits a query and returns true or false. If it returns "false" I want to show a DIV If it returns "true", I want to hide that same div. x is the variable that gets returned. In the example below I am just showing "x". I'd like to replace that with the show/hide of the div I described above. Can someone assist? Thank you.

<script language="javascript">
      function CheckIt(ID){
      var cfcAsAjax = new jsobj();
    x = cfcAsAjax.CheckIt(ID);
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Rainer JeschorCommented:
should be:
if (x==true) {
} else {

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
using jQuery: use slotToggle() function makes it very easy
Guy Hengel [angelIII / a3]Billing EngineerCommented:
sorry... based on a function. well, you can ignore my comment...
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Albert Van HalenAnalyst developerCommented:
Alternatively you can use display instead of visiblity.

Both will hide the element but setting visibility to hidden reserves the place of the element so you will end up with a 'gap' in your UI.
Have a look here;
It illustrates the difference between the two.

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earwig75Author Commented:
Should I use display none to avoid it? I'd prefer that...
Albert Van HalenAnalyst developerCommented:
To avoid the gap? Yes, you should use display and set it to none.
In order to show it should set display to inline or block.
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