// JavaScript Document
function checkEnter(e){ //e is event object passed from function invocation
var characterCode //literal character code will be stored in this variable

if(e && e.which){ //if which property of event object is supported (NN4)
e = e
characterCode = e.which //character code is contained in NN4's which property
}
else{
e = event
characterCode = e.keyCode //character code is contained in IE's keyCode property
}

if(characterCode == 13){ //if generated character code is equal to ascii 13 (if enter key)
document.siteSearch.submit() //submit the form
return false 
}
else{
return true 
}

}