错误在哪里？

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=big5"><SCRIPT LANGUAGE=JAVASCRIPT>
function setToolPic(functName) {
    // set clicked button icon to set mode
       if (functName=="Zoom In") {
document.zoomin.src="images/zoomin_2.gif";
}
}
</SCRIPT>
</head><BODY BGCOLOR="silver" TEXT="Black" LINK="White" VLINK="White" LEFTMARGIN=0 TOPMARGIN=0 RIGHTMARGIN=0 ALINK="White">
<DIV ALIGN="center">
    <img src="images/zoomin_1.gif" width=20 height=20 hspace=1 vspace=0 border=0 alt="放大" name="zoomin" onmousedown="setToolPic('Zoom In')">
</DIV>
</BODY>
</HTML>
<img src="images/zoomin_1.gif" onmouseout = "this.src=images/zoomin_1.gif" onmouseover = "this.src=images/zoomin_2.gif">
<SCRIPT LANGUAGE=JAVASCRIPT>
function setToolPic(functName) {
    // set clicked button icon to set mode
       if (functName=="Zoom In") {
document.zoomin.src="images/zoomin_2.gif";
}
}
</SCRIPT>
<HTML>
<BODY BGCOLOR="silver" TEXT="Black" LINK="White" VLINK="White" LEFTMARGIN=0 TOPMARGIN=0 RIGHTMARGIN=0 ALINK="White">
<DIV ALIGN="center">
    <img src="images/zoomin_1.gif" width=20 height=20 hspace=1 vspace=0 border=0 alt="放大" name="zoomin" onmousedown="setToolPic('Zoom In')">
</DIV>
</BODY>
</HTML>
谢谢大家，我试了把\'改成了 '，问题就解决了，但是那个中文显示问题还是不对， funove007(剑三十) ，我试了你的方法，但是还是乱码。