Here is my HTML code:
<input id="text" type="text" name="text">
<input type="button" name="page1" onclick="javascript:window.open('http://example.com/' + this.name + '/' + document.getElementById('text').value)">
<input type="button" name="page2" onclick="javascript:window.open('http://example.com/' + this.name + '/' + document.getElementById('text').value)">
<input type="button" name="page3" onclick="javascript:window.open('http://example.com/' + this.name + '/' + document.getElementById('text').value)">