javascrip for send email from webpage??????

hi:

i am new in design webpages, but i study an learning something every day. . .

i make a webpage and in page "contact us" i have a different mails for a different salesman. . . i use "mailito" for link to costumer mailer program; but exist some code, for when the visitor click en email link, appears some screen and the costumer write a "name", "email" "text", "capcha" an send directly to the email and finish and little windows disapears. . .?

maybe is the basic question, but when you are learning every question is hard, i espend a lot a time in google y nothing. . .

help, please. . .

thanks