Take a look at the code below, specifically line: var url="http://www.example.com/code.php"

function exampleFunction(str)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="http://www.example.com/code.php"
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

For some reason, my html page struggles to pull this link. However, if I change:

 var url="http://www.example.com/code.php"

to:

 var url="code.php"

and drop the file in the same directory as my html file, I have no trouble executing the code.

Am I doing something wrong? Thanks!

JavaScript has a same origin policy, that does not allow it to read anything pulled from a path beginning with http://. It was designed that way to deter cross-site-scripting attacks against remote websites.

To be more exact you cannot fetch from 1 domain, anything from another domain without using an server side proxy. The http:// has nothing to do with the mechanism.
If you stay on your site, you will be able to do absolutes (with http://) requests as well as relatives.
This to prevent malicious usage of ajax like web sites.

If you want to implement this "feature", you need to implement what is called an "ajax proxy": http://www.google.com/search?hl=en&l...=Google+Search