By the way I use this for syntax highlighting.
<pre class=”brush: java”>

</pre>

    if(loc.x>width){
      vel.x*=-1; // change direction
      vel.x*=x_loss; // dampen the velocity
      loc.x=width; // set location to outside the collision area
    }
    if(loc.x<0){
      vel.x*=-1;
      vel.x*=x_loss;
      loc.x=(1);
    }

    if(loc.y>height){
      vel.y*=-1;
      vel.y*=y_loss;
      vel.x*=x_loss; // also dampen the x movement a bit
      loc.y=height;

      // may as well only do this test when you are bouncing on the ground
      // remember that your velocities can be negative too!
      if(vel.y<.9 && vel.y>-.9){
        if(vel.x<.5 && vel.x>-.5){
          acc.x=0;
          vel.x=0;
          vel.y=0;
        }
      }
    }

Had a play with your code. Here are a few of the changes I made to simplify the changes in x velocity

set your x_loss to be between 0 and 1. eg. 0.90
this will set the x velocity to 90% of the old velocity

this dampening should mean that eventually you will match the condition to clamp the velocities and acceleration

    if(loc.x>width){
      vel.x*=-1; // change direction
      vel.x*=x_loss; // dampen the velocity
      loc.x=width; // set location to outside the collision area
    }
    if(loc.xheight){
      vel.y*=-1;
      vel.y*=y_loss;
      vel.x*=x_loss; // also dampen the x movement a bit
      loc.y=height;

      // may as well only do this test when you are bouncing on the ground
      // remember that your velocities can be negative too!
      if(vel.y-.9){
        if(vel.x-.5){
          acc.x=0;
          vel.x=0;
          vel.y=0;
        }
      }
    }