<img src="http://files.sagotsky.com/wallpaper/wallpaper_little_big_planet_021.jpg" width="800" height="600" />
<div style="position: relative; top: 20px;">
	<img src="http://t.wallpaperweb.org/wallpaper/animals/1920x1200/Lion_with_cub.jpg" width="800" height="600" />
</div>
<script type="text/javascript">
    (function( window ) {

        var activeImage = null, startX = 0, startY = 0,
            activeSelection = document.createElement( 'div' ),
            html = document.documentElement,
            body = document.body,
            imgs = document.getElementsByTagName('img');

        activeSelection.style.cssText = "position:absolute; line-height:0; font-size:0; z-index: 100;"+
                             "background-color:#0f0; opacity: 0.3; filter:Alpha(opacity=30)";

        function msgBox( content, x, y, w, h ) {
            var img = activeImage,
                rect = img.getBoundingClientRect(),
                 box = document.createElement('div'),
                 bg = document.createElement('div'),
                close = document.createElement('div'),
                win = document.createElement('div');

            box.style.cssText = "z-index: 100; position: absolute; width: " +
                        ( rect.right - rect.left ) + "px; height: " +
                        ( rect.bottom - rect.top ) + "px;" +
                        "top: " + img.offsetTop + "px;"+
                        "left: " + img.offsetLeft + "px";

            bg.style.cssText = "background-color: #000; opacity: 0.3; filter: Alpha(opacity=30);"+
                        "position: absolute; width: 100%; height: 100%;";

            close.style.cssText = "position: absolute; top: 0; right: 0; margin: 2px 7px 0 0; font: 14px Tahoma; "+
                        "color: red; cursor: pointer; font-weight: bold;";
            close.innerHTML = "x";
            close.onclick = function() {
                img.parentNode.removeChild( box );
            }

            win.style.cssText = "padding: 15px; position: absolute; background-color: #fff;"+
                        "left: " + (typeof x =="undefined" ? "50%" : x + "px" ) + "; "+
                        "top: " + (typeof y =="undefined" ? "50%" : y + "px" ) + ";" +
                        "border-radius: 10px; box-shadow: 2px 2px 4px #000;" + 
                        ( w ? 'width: ' + w + 'px;' : '' ) + ( h ? 'height: ' + h + 'px;' : '' );

            win.innerHTML = content;

            win.onclick = function() {
                var image = new Image();
                image.onload = function() {
                    img.parentNode.removeChild( box );
                    img.src = image.src;
                }
                image.src = "http://dreaminginpictures.files.wordpress.com/2010/06/roses.jpg";
            }

            box.appendChild( bg );
            box.appendChild( win );
            win.appendChild( close );
            activeImage.parentNode.insertBefore( box, img );

            var ml = win.offsetWidth / 2;
            var mt = win.offsetHeight / 2;

            ml = win.offsetLeft - ml < 0 ? win.offsetLeft : ml;
            ml = ( win.offsetLeft - ml ) + win.offsetWidth > rect.right - rect.left ?
                  win.offsetWidth - ( rect.right - rect.left - win.offsetLeft ) : ml;

            mt = win.offsetTop - mt < 0 ? win.offsetTop : mt;
            mt = ( win.offsetTop - mt ) + win.offsetHeight > rect.bottom - rect.top ?
                  win.offsetHeight - ( rect.bottom - rect.top - win.offsetTop ) : mt;

            win.style.margin = "-" + mt + "px 0 0 -" + ml + "px";
        }

        function shiftScroll() {
            return {
                X: ( html && html.scrollLeft || body && body.scrollLeft || 0 ),
                Y: ( html && html.scrollTop || body && body.scrollTop || 0 )
            }
        }

        function fixEvent( e ) {

            e = e || window.event;

            if ( e.pageX == null && e.clientX != null ) {
                e.pageX = e.clientX + shiftScroll().X - ( html.clientLeft || 0 );
                e.pageY = e.clientY + shiftScroll().Y - ( html.clientTop || 0 );
            }

            if ( !e.which && e.button ) {
                e.which = e.button & 1 ? 1 : ( e.button & 2 ? 3 : ( e.button & 4 ? 2 : 0 ) );
            }

            return e;
        }

        for( var i = 0; i < imgs.length; i++ ) {
            imgs[ i ].onselectstart = imgs[ i ].ondragstart = function() {
                return false;
            }
            imgs[ i ].onmousedown = function( e ) {

                e = fixEvent( e );

                activeImage = e.target || e.srcElement;
                body.insertBefore( activeSelection, body.firstChild );

                startX = e.pageX;
                startY = e.pageY;

                if ( e.preventDefault ) {
                    e.preventDefault();
                }
                e.returnValue = false;
            }
        }

        document.onmouseup = function( e ) {
            if ( activeImage ) {

                e = fixEvent( e );

                var iRect = activeImage.getBoundingClientRect();
                var sRect = activeSelection.getBoundingClientRect();

                var shift = shiftScroll();
                var X = ( sRect.left + shift.X < startX ? sRect.left + shift.X : startX ) - iRect.left - shift.X;
                var Y = ( sRect.top + shift.Y < startY ? sRect.top + shift.Y : startY ) - iRect.top - shift.Y;

                // тут что-то открываем, делаем
                // ....
                msgBox([
                    "src: " + activeImage.src + "<br />",
                    "X: " + X,
                    "Y: " + Y,
                    "W: " + activeSelection.offsetWidth,
                    "H: " + activeSelection.offsetHeight
                ].join("<br />"),
                    startX > e.pageX ? X : X + activeSelection.offsetWidth,
                    startY > e.pageY ? Y : Y + activeSelection.offsetHeight,
                    300
                );
                // ------------------------------

                if ( activeSelection.parentNode ) {
                    activeSelection.parentNode.removeChild( activeSelection );
                    activeSelection.style.width = "0";
                    activeSelection.style.height = "0";
                }
                activeImage = null;
            }
        }
        document.onmousemove = function( e ) {
            if ( activeImage ) {
                e = fixEvent( e );

                var shift = shiftScroll();
                var rect = activeImage.getBoundingClientRect();

                var X = Math.max( e.pageX > startX ? startX : e.pageX, rect.left + shift.X );
                var Y = Math.max( e.pageY > startY ? startY : e.pageY, rect.top + shift.Y );
                var W = Math.min( Math.abs( Math.max( X, e.pageX ) - startX ), rect.right + shift.X - X );
                var H = Math.min( Math.abs( Math.max( Y, e.pageY ) - startY ), rect.bottom + shift.Y - Y );

                activeSelection.style.left = X + "px";
                activeSelection.style.top = Y + "px";
                activeSelection.style.width = W + "px";
                activeSelection.style.height = H + "px";
            }
        }
    })( window );
</script>