1.call the dom element:
java script or snippet we call it in selenium, we can write using the dom concept or css concept .
Example: Selenium RC code
Selenium sel
sel.getEval("dom=window.document.getElementsByName('password')[0].value=test123"); //enter the password
String pwd =sel.getEval("dom=window.document.getElementsByName('password')[0].value");// retrieve the value from the application.
2.call the javascript function:
selenium.getEval("selenium.browserbot.getCurrentWindow().yourFun(1)");
note: yourFun(str) is the javacript function in html.