function warp() {
var URL = document.form.site.options[document.form.site.selectedIndex].value;
if (URL=='') {alert('Please make a selection.');} else {
window.location.href = URL;}
}

document.write('<form name="form" action="'+document.location+'">'+
'<select name="site" size="1">'+
'<option value="" selected="selected">Select a Poem in This Section</option>'+
'<option value="10.html">The Carpenter</option>'+
'<option value="20.html">A Baby\'s Secret</option>'+
'</select><input type="button" value="Go!" onclick="warp()" onkeypress="warp()" /></form>');