Relative div is passing over fixed div while scrolling page

To solve this problem we should use property name z-index.

So now ,

HTML

="navcontainer">This is navigation 

="movable_relative"> 

 
="text">text 
</div>

#navcontainer
{
    position:fixed;
    z-index:3;
}

.movable_relative
{
    position:relative; 
    z-index:2;
}

I hope your problem will now be solved.