PIE makes Internet Explorer 6-9 capable of rendering several of the most useful CSS3 decoration features.
CSS3 features:

border-radius
box-shadow
linear-gradient

http://css3pie.com/

dz.Hiim.Brain = dz.Model.extend({
    initialize: function(options){
        dz.Hiim.Brain.__super__.initialize.apply(this, arguments);
        return this;
    }
});

// Returns string Ex: "1.3.1"
$().jquery;

// Also returns string Ex: "1.3.1"
jQuery.fn.jquery;

// Provjeri da li je vrijednost nešto smisleno, npr da li je array pun
if (typeof array[index] !== 'undefined' && array[index] !== null) { }

/* VALIDATION */

/*
 * If the value is null and not required, we don't need to run through validation
 */
if (!field.value || field.value === '' || typeof field.value === 'undefined') {
    return;
}
// Regex za validation !!
var ruleRegex = /^(.+)\[(.+)\]$/,
        numericRegex = /^[0-9]+$/,
        integerRegex = /^\-?[0-9]+$/,
        decimalRegex = /^\-?[0-9]*\.?[0-9]+$/,
        emailRegex = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,6}$/i,
        alphaRegex = /^[a-z]+$/i,
        alphaNumericRegex = /^[a-z0-9]+$/i,
        alphaDashRegex = /^[a-z0-9_-]+$/i,
        naturalRegex = /^[0-9]+$/i,
        naturalNoZeroRegex = /^[1-9][0-9]*$/i,
        ipRegex = /^((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){3}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})$/i,
        base64Regex = /[^a-zA-Z0-9\/\+=]/i;
// Koristi se: npr.:   emailRegex.test('tvlahovi@gmail.com')    -> Vraca true ili false

jQuery(document).ready(function($) {
// $() will work as an alias for jQuery() inside of this function
});

// jQuery noConflict wrapper:
(function($) {
// $() will work here
$('.something').each( function(){
$(this).addClass( 'stuff' );
});
$.data( document.body, 'foo', 1337 );
})(jQuery);