Opening a long URL on click of button in CRM Web UI

Hi Experts,

I am facing an issue while opening a long URL (length greater than 255 char) on the click of a button in CRM Web UI.

I have declared an attribute zv_url type string and populated the variable in event handler.

Thereafter I have written below logic in .htm:

<script type="text/javascript" language="javascript">
window.open("<%=controller->zv_url%>").focus();
</script>

But the logic is not opening my URL, it is just opening a web window 'res://ieframe.dll/http_400.htm' with error page HTTP 400 Bad Request.

If I try to modify the variable zv_url in debugging with a short url say 'http://www.google.com', it works correcly but due to the length of url, the logic is opening error page.

Can you please help me out with this issue?

Thanks in advance,

Nitin Karamchandani.