Script for clicking Proceed button at Google Play cart every 4sec to buy Nexus

It really helps, my friend just got his Nexus 4 order with this script. In Google Chrome press Ctrl+Shift+J, paste the script to Console, and hit Enter.

setInterval( function() { var buttons = document.getElementsByClassName( 'buy-button-price' ); for ( var i = 0; i < buttons.length; i++ ) { if ( buttons[i].value === 'Proceed' ) { buttons[i].click(); console.log("click") } } }, 4000);