Execution hangs after clicking on Element

I have a file upload functionality. thought of using auto-it and developed the script
I have used the below script to click on choose button

driver.findElement(By.cssSelector("span.ui-button-text:contains("Choose")).click()
selenium.click("css=span.ui-button-text:contains("Choose"));

The driver.findElement is not bringing up the window where as selenium.click() brings the popup, but hangs in this step, control is not going to next step in selenium RC.

The execution got hang, there is no error message and execution is also not stopped completely.

Someone please let me know whether this can be handled in any other way. I need to submit a feasibility analysis for selenium and Iam stuck here.

If you are using Selenium 2 then you can use sendKeys() API to send file path to upload text box. You don't need to click choose button in doing so.

There is no text box to enter file name.
We have choose button and a non-editable box displayed in the bottom.
Once we select the file the file details and whether it is valid or not will be displayed in the box

By removing wait time on window in autoit script and placing the autoit script before button clicking, solved the issue

driver.findElement(By.cssSelector("span.ui-button-text:contains("Choose")).click()
selenium.click("css=span.ui-button-text:contains("Choose"));

Added double quote at the end
driver.findElement(By.cssSelector("span.ui-button-text:contains("Choose")").click()
selenium.click("css=span.ui-button-text:contains("Choose")");

if still it gives error then use

driver.findElement(By.cssSelector("span.ui-button-text:contains('Choose')").click()
selenium.click("css=span.ui-button-text:contains('Choose')");