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Why does (runat="server") prefix my id tags with ctl100_?

ctl100
ctl100 asked
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Last Modified: 2012-05-06
In my html document I have a line like:

            <h1 runat="server" id="testText">SAMPLE HEADING</h1>

to dynamically change the inner text at run time in the code behind using:

             this.testText.innerText="NEW HEADING";

....

I want to be able to use CSS to style this heading based on the id tag of "testText"; however at run-time the id name gets prefixed with "ctl100_"

Is there a way to prevent this prefixing?

Using C# and ASP.NET 2.0
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