how to get elements count in selenium

Hi

I am clicking on a web element by this code Selenium.click("class=rtPlus");

here i am having so many elements with same class=trPlus, so i need the count to do for loop.

Can any one suggest me how to get the count

I am new to selenium.. so could you please help me in detail...

Thanks in advance,
silpa

getXpathCount API might help - http://selenium.googlecode.com/svn/trunk/docs/api/java/com/thoughtworks/selenium/DefaultSelenium.html#getXpathCount(java.lang.String)