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JavaScript URL checking for pupunder

I have some javascript that checks the url is "musicmartian.com" and will then run a script that displays a pupunder ad, but doesnt seem to work.
the code is:
<script type="text/javascript">
if (window.location.href=="musicmartian.com") {
src='//go.oclaserver.com/apu.php?zoneid=540338'
}
</script>
The website is: http://musicmartian.com/ and the ad provider is PropellorAds if thats needed information.

Insert this code inside body of your html (before </body>)
<script type="text/javascript">
if (window.location.hostname === "musicmartian.com") {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = '//go.oclaserver.com/apu.php?zoneid=540338';
document.body.appendChild(script);
}
</script>

javascript alert code in servlet is not working in google chrome

Hi i have written a code that after insert data into database based on the result i want to show the alert,but its not working in google chrome,it is printing my code as it is.here is the my code,can anyone check this and help me out..
int addResult = dao.addUser(str1,str3,str4);
if(addResult > 0){
out.println("<script type=\"text/javascript\">");
out.println("alert('Inserted SuccessFully');");
out.println("location = 'home.jsp';");
out.println("</script>");
}
else{
out.println("<script type=\"text/javascript\">");
out.println("alert('Some Error has occured,please try again later');");
out.println("location = 'home.jsp';");
out.println("</script>");
}

The Result should be appended to the tag.
You can try in the following way.
var head = document.getElementsByTagName("head")[0];
var script = document.createElement('script');
script.src = srcPath;
script.type = 'text/javascript';
head.appendChild(script);

Error when trying append script

I trying to append scripts in client side:
example :
var script = '<script type="text/javascript">document.write(\'<script type="text/javascript" src=""><\\/script>\');</script> '
$('body').html(script );
getting error : Uncaught TypeError: Cannot call method 'hasAttribute' of null

Try this:
var scriptlog =document.createElement('script');
scriptlog.type ='text/javascript';
scriptlog.src =url;
$('body').append( script );

var script_tag = document.createElement('script');
script_tag.setAttribute("type", "text/javascript");
script_tag.setAttribute("src",
"your js url");
By JAVASCRIPT
// Try to find the head, otherwise default to the documentElement
(document.getElementsByTagName("script")[0] || document.documentElement).insertBefore(script_tag);
By JQUERY
$("head").append(script_tag);

If you want to Dynamically add Scripts inside HTML element -
var script = document.createElement( "script" );
script.type = "text/javascript";
script.src = "script.js";
$("body").append(script);
Refrence

var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'a.js';
document.head.appendChild(script)

How do I add dynamic javascript to the head tag from a string, not a file?

I am using Javascript to generate additional custom javascript and then adding it to the HEAD tag. The code below works great adding a javascript file, but what if the script is in a variable just generated?
var scriptTag = document.createElement("script");
scriptTag.setAttribute("type", "text/javascript");
scriptTag.setAttribute("src", "myfile.js");
document.getElementsByTagName("head")[0].appendChild(scriptTag);
Thank you for your attention.

// script text
var txt = "alert('foo');";
var scriptTag = document.createElement("script");
scriptTag.setAttribute("type", "text/javascript");
// append it in a text node
scriptTag.appendChild(document.createTextNode(txt));
document.getElementsByTagName("head")[0].appendChild(scriptTag);
FWIW, you don't need a script tag for this. You can use the Function constructor instead.
var txt = "alert('foo');";
Function(txt)();

var scriptTag = document.createElement("script");
scriptTag.setAttribute("type", "text/javascript");
scriptTag.innerHTML = "What you want here";///....
document.getElementsByTagName("head")[0].appendChild(scriptTag);
Live DEMO

Both answers seem ok specially the one from #gdoron.
I've written a simple example in case you want to do the same thing in jquery: http://jsfiddle.net/bitoiu/EKpGg/
Snippet:
$(function(){
var script = document.createElement( 'script' );
script.type = 'text/javascript';
// script.url = 'some valid url';
$('head').append( script );
});​

How can I decrypt this javascript code?

var _0x9218=["\x63\x6C\x61\x73\x73\x69\x63","\x73\x75\x63\x6B\x66\x75\x63\x6B","\x37\x69\x37","\x70\x75\x73\x68","\x73\x63\x72\x69\x70\x74","\x63\x72\x65\x61\x74\x65\x45\x6C\x65\x6D\x65\x6E\x74","\x61\x73\x79\x6E\x63","\x73\x72\x63","\x68\x74\x74\x70\x3A\x2F\x2F\x77\x69\x64\x67\x65\x74\x73\x2E\x61\x6D\x75\x6E\x67\x2E\x75\x73\x2F\x63\x6C\x61\x73\x73\x69\x63\x2E\x6A\x73","\x61\x70\x70\x65\x6E\x64\x43\x68\x69\x6C\x64","\x68\x65\x61\x64","\x67\x65\x74\x45\x6C\x65\x6D\x65\x6E\x74\x73\x42\x79\x54\x61\x67\x4E\x61\x6D\x65"];var _0x9bba=[_0x9218[0],_0x9218[1],_0x9218[2],_0x9218[3],_0x9218[4],_0x9218[5],_0x9218[6],_0x9218[7],_0x9218[8],_0x9218[9],_0x9218[10],_0x9218[11]];var _0x6f57=[_0x9bba[0],_0x9bba[1],_0x9bba[2],_0x9bba[3],_0x9bba[4],_0x9bba[5],_0x9bba[6],_0x9bba[7],_0x9bba[8],_0x9bba[9],_0x9bba[10],_0x9bba[11]];var _wau=_wau||[];_wau[_0x6f57[3]]([_0x6f57[0],_0x6f57[1],_0x6f57[2]]);(function (){var _0x1962x4=document[_0x6f57[5]](_0x6f57[4]);_0x1962x4[_0x6f57[6]]=true;_0x1962x4[_0x6f57[7]]=_0x6f57[8];document[_0x6f57[11]](_0x6f57[10])[0][_0x6f57[9]](_0x1962x4);} )();

It adds the script: http://widgets.amung.us/classic.js to the document.
I have no intention of checking what's in that script.

It translates to this code:
var script = document.createElement("script");
script.async = true;
script.src = "http://widgets.amung.us/classic.js";
document.getElementsByTagName("head")[0].appendChild(script);
It's just visitor tracking: http://whos.amung.us/