未捕获的SyntaxError：意外的令牌非法

我正在接收未捕获的SyntaxError：使用此代码的chrome中的意外标记ILLEGAL：

   var leftMiddleJS = 'function onmouseover() {
        document.getElementById("background").style.marginTop = "-135px"; 
        document.getElementById("background").style.marginLeft = "0px";
        document.getElementById("background").style.width = "760px";
        document.getElementById("background").style.height = "520px";
        document.getElementById("background").style.marginTop = "0";
        document.getElementById("background").style.marginLeft = "0";

        function click() { 
        document.getElementById("outsideContainer").style.marginTop = "0"; 
        document.getElementById("outsideContainer").style.marginLeft = "0"; 
        document.getElementById("outsideContainer").style.width = "300px"; 
        document.getElementById("outsideContainer").style.height = "250px"; 
        document.getElementById("insideContainer").style.marginTop = "-135px"; 
        document.getElementById("insideContainer").style.marginLeft = "0px"; }';

代码有什么问题？

---

如果你想分配一个跨越多行的字符串 - 使用字符串延续：

var leftMiddleJS = 'function onmouseover() { 
        document.getElementById("background").style.marginTop = "-135px";  
        document.getElementById("background").style.marginLeft = "0px"; 
        document.getElementById("background").style.width = "760px"; 
        document.getElementById("background").style.height = "520px"; 
        document.getElementById("background").style.marginTop = "0"; 
        document.getElementById("background").style.marginLeft = "0"; 

        function click() { 
        document.getElementById("outsideContainer").style.marginTop = "0"; 
        document.getElementById("outsideContainer").style.marginLeft = "0"; 
        document.getElementById("outsideContainer").style.width = "300px"; 
        document.getElementById("outsideContainer").style.height = "250px"; 
        document.getElementById("insideContainer").style.marginTop = "-135px";  
        document.getElementById("insideContainer").style.marginLeft = "0px"; }';

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