<formname="form5"id="form5"method="post"action="#">

<inputtype="file"name="file5"id="file5"onchange="preview5()"/>

</form>

<scripttype="text/javascript">

functionpreview5(){

varx=document.getElementById("file5");

if(!x||!x.value)return;

varpatn=/.jpg$|.jpeg$|.gif$/i;

if(patn.test(x.value)){

vary=document.getElementById("img5");

if(y){

y.src="file://localhost/"+x.value;

}else{

varimg=document.createElement("img");img.setAttribute("src","file://localhost/"+x.value);

img.setAttribute("width","120");

img.setAttribute("height","90");

img.setAttribute("id","img5");

document.getElementById("form5").appendChild(img);

}

}else{

alert("您选择的似乎不是图像文件。");

}}

</script>