Load Css If Specified Text Not Present?

I'm trying to create/find a script that will do the following: -load a css file regardless of any conditions. -do not load the css file if a certain text is present in a specified html div tag.

i know this is done with a if/else state like this:

if (condition)
{
code to be executed if condition is true

[Code].....

how to add the condition for the variable text and to specify the css file.

I want the javascript to ignore loading the css if a div tag like this: <div class="menu-opener"><a class="gwt-Anchor" href="javascript:">Text1<img src=..//img.jpg"></a> /div>contains the word Text1, or any other I specify. Else, if any other text inside the div, the css should load normally.