Passing multiple values with window.location.href

So far I have this

<script>
window.location.href="data_entry.php?value1=<?php echo $value1; ?>" +;
</script>

how can I pass another value on another variable aside from value1? I want a new variable to get a value. Thanks

<script>
window.location.href="data_entry.php?value1=<?php echo $value1; ?>" +"&value2=<?php echo $value2; ?>";
</script>