How can I execute a Javascript function or not depending on the existance of an element or not?

How can I execute a Javascript function or not depending on the existance
of an element or not?

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How can I execute a Javascript function or not depending on the existance
of an element or not? ... to see if this element exists and if it does
then execute the ...
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JavaScript Functions - W3Schools Online Web Tutorials
When you call a function, you can pass ... It is not the entire JavaScript
that ... The innerHTML of the "demo" element will be 5, which is what the
function ...
www.w3schools.com/js/js_functions.asp - Cached

Determining the existence of a variable - JavaScript Kit ...
In other words, can I ask JavaScript whether , say ... and do something
different, depending on the ... and not only does not successfully detect
...
www.javascriptkit.com/javatutors/​determinevar.shtml - Cached

Is there an "exists" function for jQuery? - Stack Overflow
How can I check the existence of an element in ... Execute the chain only
if a jQuery element ... #button').ifExists("#button does not exits",
function() ...
stackoverflow.com/questions/31044 - Cached

javascript | Flashcard | Course Hero
Which is not a valid JavaScript ... To test and execute JavaScript
statements without an ... function can be used as a selector which returns
a DOM ...
www.coursehero.com/flashcards/252406/​javascript - Cached

JavaScript Madness: Dynamic Script Loading
We just want to execute the already loaded function. ... script
language="JavaScript"> function ... or may not be an advantage depending
on your ...
unixpapa.com/js/dyna.html - Cached

Tutorial - Combining Window Events - The Script Asylum
With Javascript, you can make something else ... Let's say you want to
execute a javascript function ... functions that do not need the element
reference for ...
www.scriptasylum.com/tutorials/​pageevents.html - Cached

irt.org - JavaScript Frame FAQ
FAQ 117 Can I "execute" function test() ... FAQ 389 How can I test for the
existence of a function in another frame? ... Not Online. Instant
JavaScript.
www.irt.org/script/frame.htm - Cached

JavaScript - Wikipedia, the free encyclopedia
History|Trademark|Features|Syntax and semanticsJavaScript includes an eval
function that can execute ... // accessing the same < h1 > element < /
script ... and not all browsers execute JavaScript. ...
en.wikipedia.org/wiki/JavaScript - CachedMore results from
en.wikipedia.org »IBM Cognos and JavaScript – Part I | The Ironside Group
... writing JavaScript code is not for ... JavaScript can be set to
execute when ... In the following example we will call a very simple
JavaScript function: ...
www.ironsidegroup.com/2011/07/25/ibm-&#8203;cognos-and... - Cached