Sostituisci questo:
codice:
window.open('Used_280.html','buttonwin','height=490,width=700,scrollbars=no,toolbar=no,location=no,screenX=100,screenY=20,top=100,left=150','fullscreen=no')
con questo
codice:
window.open(\ 'Used_280.html\ ',\ 'buttonwin\ ',\ 'height=490,width=700,scrollbars=no,toolbar=no,location=no,screenX=100,screenY=20,top=100,left=150\ ',\ 'fullscreen=no\ ')
Togliendo lo spazio tra backslash (\) e apice (')