Animating an html element in Jquery
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"monitor" is a box which shows enlarged text everytime mouse is hovered on a part of the page(web) 

"+" and "-" are the two buttons which help me increase and decrease the box size,respectively. 

The problem arises when text in the box overflows the box and makes my code look inefficient. Here is a sample for making the plus button increase box size(text size)
In simple words I just want to put some limit on this box so that its size gets a threshold value and a maximum value

    $('div.monitor').animate({ 'fontSize': '+=10pt' }, 'fast'); return false; break;