Open window in web ui probleme

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Hello,

1-i have created a bsp page test.pdf which has an URL lv_url

2- in bsp_wd_cmpwb i have a view, which contain page.htm , in Layout i have :

<%
if controller->url is not initial. " Line 1
%> " Line 2
<script language="javascript"> " Line 3
window.open("<%= controller->url %>").focus();

</script>
<%
endif .
%>

The controller->url is filled by 'lv_url in previous events , until here its OK .

The problem :

When i click the first time in button(in my view) its go very well (it shows me test.pdf), but if i click another time in the button it shows nothing .

but If i change the url in debugger ( for exemple while pasing by in line 2) and i give http://www.google.com , it works very well .

if i execute after www.google .com the 'xxxxxx' its go very well .

So the problem is i can't execute the same URL two times successively

Thanks for your help