比较COOL的滤镜效果

<SCRIPT language=JavaScript>
var isNav, isIE
var offsetX, offsetY
var selectedObj

var dragimg_width=132
var dragimg_height=100

var dragimg_startx=270
var dragimg_starty=185

var clipLeft=dragimg_startx
var clipTop=dragimg_starty

var clipRight=clipLeft+dragimg_width
var clipBottom=clipTop+dragimg_height

if (parseInt(navigator.appVersion) >= 4) {
    if (navigator.appName == "Netscape") {
        isNav = true
    } else {
        isIE = true
    }
}

function setZIndex(obj, zOrder) {
    obj.zIndex = zOrder
}

function shiftTo(obj, x, y) {
    if (isNav) {
        obj.moveTo(x,y)
        document.bgimage.clip.top=y
        document.bgimage.clip.left=x
        document.bgimage.clip.bottom=y+dragimg_height
        document.bgimage.clip.right=x+dragimg_width   
   
    }
    else {
        clipTop=y
        clipLeft=x
        clipBottom=y+dragimg_height
        clipRight=x+dragimg_width
        document.all.bgimage.style.clip="rect("+clipTop+" "+clipRight+" "+clipBottom+" "+clipLeft+")"
        obj.pixelLeft = x
        obj.pixelTop = y
    }
}

function setSelectedElem(evt) {
    if (isNav) {
        var testObj
        var clickX = evt.pageX
        var clickY = evt.pageY
        for (var i = document.layers.length - 1; i >= 0; i--) {
            testObj = document.layers[i]
            if ((clickX > testObj.left) &&
                (clickX < testObj.left + testObj.clip.width) &&
                (clickY > testObj.top) &&
                (clickY < testObj.top + testObj.clip.height) && (testObj.name=="picture1")) {
                    selectedObj = testObj
                    setZIndex(selectedObj, 100)
                    return