getting the value of textbox to another html file

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I have a textbox in index.html and I want get the value of it and put it to textbox in another html file which is result.html. (they have the same .js file using)index.html textbox:\[code\]<input id="txt2" readonly="true" type="number" value="http://stackoverflow.com/questions/14414349/0" name="score" style="border:none;background-color:#f0f2f7">\[/code\]result.html textbox:\[code\]<input id="txt3" readonly="true" type="number" value="http://stackoverflow.com/questions/14414349/0" name="score" style="border:none;background-color:#f0f2f7"></td>\[/code\]this is the code where it will automatically go to the other page:\[code\] if((mins == 0) && (secs == 0)) { //window.alert("Time is up.Your score is "+score); // change timeout message as required document.getElementById('txt2').value = http://stackoverflow.com/questions/14414349/score; window.location ="score.html" // redirects to specified page once timer ends and ok button is pressed } else { cd = setTimeout("redo()",1000); }\[/code\]and how will txt3 get the value of txt2 since they are in different html?thanks in advance.