i have problem with my site js & IE9

[m.riyahi]

hi
at the first Sorry for my bad english.
I have a joomla at the wrap5.5 framework
I knew my frame work for Regulation module position height have a js function.
this function is ok in IE5 & ff but in IE9 show very tall my module height.
but i dont know what is wrong on this function . i dont know anything about JS.
this function :

(function(e){e.fn.matchHeight=function(f){var a=0;this.each(function(){a=Math.max(a,e(this).outerHeight())});f&&(a=Math.max(a,f));return this.each(function(){var c=e(this),b=c.outerHeight()-c.height();c.css("min-height",a-b+"px")})}

[m.riyahi]

my site:
http://www.joomi.ir

[m.riyahi]

in buttom code ie9 wrong Know "b" value. because when delet "-b" working ok.but i don't know how to campatible this ?
Code:

(function(e) {
e.fn.matchHeight = function(f) {
    var a = 0;
    this.each(function() {
        a = Math.max(a, e(this).outerHeight())
    });
    f && (a = Math.max(a, f));
    return this.each(function() {
        var c = e(this),
            b = c.outerHeight() - c.height();
        c.css("min-height", a - b + "px")
    })
}​

my website:http://www.joomi.ir