Javascript And Forms

how do you get the value of a form with javascript?

var X = document.formname.elementname.value

formname is the name of the form

elementname is the name of the form element

you can reference the value directly, you do not have to assign it to another variable. For example

if(document.formname.elementname.value=="Y"){
alert("The value is Y")
}else{
alert("The value in not Y")
}