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The focus method is handy when error checking forms. All it does is put the cursor in the given element, which although simple, can be quite handy for the user. Using focus is really simple:

<script type=‘text/javascript’>
function error_check()
{
if(document.myform.myfield.value == ‘’)
{
alert(“Please fill in all fields!”);
document.myform.myfield.focus();
return;
}
else
{
//sucess, what to do. . .
}
}</script>

Useful and simple, a very good combination. Focus is a pretty simple function, but it adds to the user experience, which is always good.