:text will fail for a input with a type value of hidden. It’s also much more efficient to just use:
$("#texens").val("tinkumaster");
ID attributes should be unique on a web page, make sure yours are as this may contribute to any problems you’re having, and specifying a more complicated selector just slows things down and doesn’t look as neat.
Example at http://jsbin.com/elovo/edit, using your example code at http://jsbin.com/elovo/2/edit[