Error with html result

I use FCKEditor 2.6.3 for ASP.NET and I get a problem that I can't fix

Design View:
content line abc
Content line def

Source View:
<p>content line abc <br />
Content line def</p>

If I use FCKConfig.FormatSource=false , I get :

Source View:
<p>content line abc <br /> Content line def</p>

In the two cases, I get result at source code view of html page :

&lt;p>content line abc &lt;br />
Content line def lt;/p>

My problem is that I can't use this for my tooltip javascript code. To use it, I need the paragraph without line break like:
&lt;p>content line abc &lt;br />Content line def lt;/p>

How can I fix it ?