<form name="MyForm">
<input tpe="text" name="MyField" value="Text">
<input type="button" value="test" onclick="MyTest()">
document.MyForm.MyField.value
<form name="MyForm">
<input tpe="text" name="MyField" value="Text">
<input type="button" value="test" onclick="MyTest()">
document.MyForm.MyField.value