jqDnR拖拽溢出的修改

/*
* jqDnR - Minimalistic Drag'n'Resize for jQuery.
*
* Copyright (c) 2007 Brice Burgess <[email protected]>, http://www.iceburg.net/
* Licensed under the MIT License:
* http://www.opensource.org/licenses/mit-license.php
* 
* $Version: 2007.08.19 +r2
* last modified by leegle 2011.02.11
* fix bug:溢出之后不能回来的,添加在范围内移动
*/

(function($) {
    $.fn.jqDrag = function(h) { return i(this, h, 'd'); };
    $.fn.jqResize = function(h) { return i(this, h, 'r'); };
    $.jqDnR = { dnr: {}, e: 0,
        drag: function(v) {
            if (M.k == 'd') {
                 //修改的位置  李飞二〇一一年二月十一日 14:35:19
                 E.css({ left: (M.X + v.pageX - M.pX)<0? 0:(M.X + v.pageX - M.pX)<document.documentElement.clientWidth- M.W?(M.X + v.pageX - M.pX):document.documentElement.clientWidth- M.W, top: (M.Y + v.pageY - M.pY)<0?0:(M.Y + v.pageY - M.pY)<document.documentElement.clientHeight -M.H ?(M.Y + v.pageY - M.pY): document.documentElement.clientHeight- M.H });
            }
            else {E.css({ width: Math.max(v.pageX - M.pX + M.W, 0), return false;}
          
           
        },
        stop: function() { E.css('opacity', M.o); $(document).unbind('mousemove', J.drag).unbind('mouseup', J.stop); }
    };
    var J = $.jqDnR, M = J.dnr, E = J.e,
i = function(e, h, k) {
    return e.each(function() {
        h = (h) ? $(h, e) : e;
        h.bind('mousedown', { e: e, k: k }, function(v) {
            var d = v.data, p = {}; E = d.e;
            // attempt utilization of dimensions plugin to fix IE issues 
            if (E.css('position') != 'relative') {
                p = E.position();
                if (!($.browser.msie && ($.browser.version == "6.0")) && (E.css('position') == 'fixed')) {
                    p.top -= $(window).scrollTop(); p.left -= $(window).scrollLeft()
                }
              
            }
          
            M = { X: p.left || f('left') || 0, Y: p.top || f('top') || 0, W: f('width') || E[0].scrollWidth || 0, H: f('height') || E[0].scrollHeight || 0, pX: v.pageX, pY: v.pageY, k: d.k, o: E.css('opacity') };
            E.css({ opacity: 0.8 }); $(document).mousemove($.jqDnR.drag).mouseup($.jqDnR.stop);
            return false;
        });
    });
},
f = function(k) { return parseInt(E.css(k)) || false; };
})(jQuery);