Set the height of an element to the height of the window

fullHeight.js

$.fn.fullHeight = function( offset ){
    
    // Check if offset specified
    if (offset === '') {

        // If it's not then set it to 0
        offset =  0;
    }
    
    // Maintain chainability
    return this.each( function(){
         
        // Set the height minus the offset
        $(this).css({
            'height' : $(window).height() - offset
        });
         
    });
     
}