Stop function execution is input element has focus?

Answer 1

I think you want line 7:

$(this).isFocused == "false";

to be

$(this).isFocused = "false";

Answer 2

I think the following would probably evaluate the same in this instance, but shouldnt:

if ($(this).hasfocus == "true") return;

be:

if ($(this).hasfocus == true) return;

Answer 3

You might want to refactor a bit.

Create named functions, or [better]create an object (global is ok if You don't have a lot of js out there) and put Your functions in that object so that they have names.

MyAwesomeGlobalSomething={};
MyAwesomeGlobalSomething.mOverFunc=function(){
  //the stuff You do
       if ($(this).hasfocus == true) return;
            else {
                var text = getAttr($(this));
                $(this).removeClass();
                if($(this).attr("value") == text) $(this).addClass('inputOver clear');
                else $(this).addClass('inputOver filled');
            }
}
//and more functions here

You can now bind

 $('.input').mouseover(MyAwesomeGlobalSomething.mOverFunc);

now

$('.input').focus(function(){
  $(this).unbind('mouseover');
//and more functions here
});

fixes Your problem and

$('.input').blur(function(){
  $(this).mouseover(MyAwesomeGlobalSomething.mOverFunc);
//and more functions here
});

returns the function binding