how to select checkbox whose id is not known or dynamic with selenium RC

Hi All,
I need to select checkbox in the web application whose id is  appended dynamically,Can you please help me

Thanks,
Narender chary

following is the html code snip from the web application
--------------------------‹‹
<table id="someid">
<tr>
<td>
<input id="someDynamicId" type="checkbox" .....>mycheckbox
</td>
</tr>
</table>

my requirement is
1.check checkbox whose value/lable is mycheckbox and if this matches select this checkbox
2.i need to do this in Selenium RC.

The following block of code should do, but this is WebDriver not RC. The similar logic should work in RC also.

Code:

//To get the check box with value MY_CHECKBOX_VALUE
WebElement checkBox = driver.findElement(By.xpath("//input[@type = 'checkbox' and @value = '<MY_CHECKBOX_VALUE>']"));

//To select the checkbox
if(checkBox != null)
checkBox.click();

Hi,
the above mention solution driver.findElement(By.xpath("//input[@type='checkbox' and @value='my_checkbox_value']")) will work if html code like below

<td>
<input id="someDynamicId" type="checkbox" .....>mycheckbox
</td>

but hovewer my actual html source  is something like below
--------
<table id="someid">
<tr>
<td>
<input id="someDynamicId" type="checkbox" .....>
</td>
<td>mycheckbox</td>
</tr>
</table>

Please suggest

Hi,
i have done following steps and its worked
1.read all the check box id's in web page like below
 int checkboxCount = selenium.getXpathCount("//input[@type='checkbox']").intValue();
              String checkBoxIds[]=new String[checkboxCount];
for (int i = 1; i < checkboxCount + 1; i++) {
            System.out.println(selenium.getAttribute("//body/descendant::input[@type='checkbox'][" + i + "]@id"));
            if (selenium.getAttribute("//body/descendant::input[@type='checkbox'][" + i + "]@id").startsWith("check")) {
                checkBoxIds[i-1]=selenium.getAttribute("//body/descendant::input[@type='checkbox'][" + i + "]@id");
            }
            
        }
            
        }

2.Iterate all the rows in the table and select the check box whose lable is matched with the requirement
    Number num =selenium.getXpathCount("//html/body/div/div[1]/table[1]/tbody/tr[2]/td[2]/div[1]/div[4]/div[3]/table/tbody[2]/tr/");
            int i= num.intValue();
            for (int j = 1; j <i+1; j++) {
                      if (selenium.getText("//html/body/div/div[1]/table[1]/tbody/tr[2]/td[2]/div[1]/div[4]/div[3]/table/tbody[2]/tr["+j+"]/td[4]").equals(messageToDelete)) {
                           selenium.check("//input[@id='"+checkBoxIds[j-1]+"']");
                   }
            }
            selenium.click("id_of_target");

Thanks,