How to focus text box

In my application what script should i write


My application is basically Test Taking

Student gives fill in the choice answer and click on submit and continue button

E.g
What is your age?
Text box will be there when student types:30 or any numerical value then only submit and continue button gets enabled

i wrote scripts as given below:

STUDENT	funVerifyText	//*[@id='ctl00_ContentPlaceHolder1_lblExamProgress']	15 of 20
STUDENT	funWaitForElementPresent	//*[@id='ctl00_ContentPlaceHolder1_147933']	NA
STUDENT	type	//*[@id='ctl00_ContentPlaceHolder1_147933']	85
STUDENT	funWaitForElementPresent	ctl00_ContentPlaceHolder1_btnContinue	NA
STUDENT	click	ctl00_ContentPlaceHolder1_btnContinue	NA
STUDENT	funPause	2000	NA
STUDENT	waitForPageToLoad	200000	NA

Also tell how to capture for Window media player there is media player unless and until you click on play button submit and continue will not be enabled