var res = 1;

if (screen.width > 2250) {document.write('<script type="text/javascript" src="../scripts/ziezo_mainscript5.js"></script>'); res = 5; }
else if (screen.width > 1800) {document.write('<script type="text/javascript" src="../scripts/ziezo_mainscript4.js"></script>'); res = 4; }
else if (screen.width > 1500) {document.write('<script type="text/javascript" src="../scripts/ziezo_mainscript3.js"></script>'); res = 3; }
else if (screen.width > 1250) {document.write('<script type="text/javascript" src="../scripts/ziezo_mainscript2.js"></script>'); res = 2; }
else {document.write('<script type="text/javascript" src="../scripts/ziezo_mainscript1.js"></script>'); }