function checkEnter(e,button){ //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.getElementById(button).click();
	return false; 
}
else
{
	return true; 
}

}

function clickclear(thisfield, defaulttext) {
        if (thisfield.value == defaulttext) {
               thisfield.value = "";
        }
}
function clickrecall(thisfield, defaulttext) {
        if (thisfield.value == "") {
               thisfield.value = defaulttext;
        }
}

function setVisibility(id, visibility) {
document.getElementById(id).style.display = visibility;
}