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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>網頁特效觀止|www.jscode.cn| --- 給地圖加個放大鏡</title> <SCRIPT> var shrinkfactor=5 // left and top position of the thumbnailimage // (distance to the left and top browser-margin, pixels) var thumbleft = 30 var thumbtop = 30 // left and top position of the zoomed image // (distance to the left and top browser-margin, pixels) var largeleft = 300 var largetop = 30 // width and height of the enlarged image's sector (visible part, pixels) var clipwidth = 240 var clipheight = 160 </SCRIPT> <SCRIPT> var isNav, isIE var offsetX, offsetY var selectedObj var largewidth = 0 var largeheight = 0 var thumbwidth = Math.floor(largewidth/shrinkfactor) var thumbheight = Math.floor(largeheight/shrinkfactor) var dragimgwidth = Math.floor(clipwidth/shrinkfactor) var dragimgheight = Math.floor(clipheight/shrinkfactor) var dragimgleft = thumbleft+3 var dragimgtop = thumbtop+3 var difleft= largeleft-thumbleft var diftop= largetop-thumbtop var clippoints var cliptop=0 var clipbottom=cliptop+clipheight var clipleft=0 var clipright=clipleft+clipwidth 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) { if(x<=document.thumb.left) {x=document.thumb.left} if(x>=(document.thumb.left+thumbwidth-dragimgwidth-2)) {x=document.thumb.left+thumbwidth-dragimgwidth-2} if(y<=document.thumb.top) {y=document.thumb.top} if(y>=(document.thumb.top+thumbheight-dragimgheight-2)) {y=document.thumb.top+thumbheight-dragimgheight-2} obj.moveTo(x,y) } else { if(x<=document.all.thumb.style.posLeft) {x=document.all.thumb.style.posLeft} if(x>=(document.all.thumb.style.posLeft+thumbwidth-dragimgwidth-2)) {x=document.all.thumb.style.posLeft+thumbwidth-dragimgwidth-2} if(y<=document.all.thumb.style.posTop) {y=document.all.thumb.style.posTop} if(y>=(document.all.thumb.style.posTop+thumbheight-dragimgheight-2)) {y=document.all.thumb.style.posTop+thumbheight-dragimgheight-2} obj.pixelLeft = x obj.pixelTop = y } cliptop = (y-thumbtop)*shrinkfactor clipbottom = cliptop+clipheight clipleft = (x-thumbleft)*shrinkfactor clipright = clipleft+clipwidth if (document.all) { clippoints ="rect("+cliptop+" "+clipright+" "+clipbottom+" "+clipleft+")" document.all.large.style.posTop=largetop-cliptop document.all.large.style.posLeft=largeleft-clipleft document.all.large.style.clip=clippoints } if (document.layers) { document.large.top=largetop-cliptop document.large.left=largeleft-clipleft document.large.clip.left = clipleft document.large.clip.right = clipright document.large.clip.top = cliptop document.large.clip.bottom = clipbottom } } function setSelectedElem(evt) { if (isNav) { var testObj var