window.document.onkeydown = disableRefresh;function disableRefresh(evt){evt = (evt) ? evt : window.eventif (evt.keyCode) {   if(evt.keyCode == 116){     //do something   }}}keycode 8 = BackSpace BackSpacekeycode 9 = Tab Tabkeycode 12 = Clearkeycode 13 = Enterkeycode 16 = Shift_Lkeycode 17 = Control_Lkeycode 18 = Alt_Lkeycode 19 = Pausekeycode 20 = Caps_Lockkeycode 27 = Escape Escapekeycode 32 = space spacekeycode 33 = Priorkeycode 34 = Nextkeycode 35 = Endkeycode 36 = Homekeycode 37 = Leftkeycode 38 = Upkeycode 39 = Rightkeycode 40 = Downkeycode 41 = Selectkeycode 42 = Printkeycode 43 = Executekeycode 45 = Insertkeycode 46 = Deletekeycode 47 = Helpkeycode 48 = 0 equal bracerightkeycode 49 = 1 exclam onesuperiorkeycode 50 = 2 quotedbl twosuperiorkeycode 51 = 3 section threesuperiorkeycode 52 = 4 dollarkeycode 53 = 5 percentkeycode 54 = 6 ampersandkeycode 55 = 7 slash braceleftkeycode 56 = 8 parenleft bracketleftkeycode 57 = 9 parenright bracketrightkeycode 65 = a Akeycode 66 = b Bkeycode 67 = c Ckeycode 68 = d Dkeycode 69 = e E EuroSignkeycode 70 = f Fkeycode 71 = g Gkeycode 72 = h Hkeycode 73 = i Ikeycode 74 = j Jkeycode 75 = k Kkeycode 76 = l Lkeycode 77 = m M mukeycode 78 = n Nkeycode 79 = o Okeycode 80 = p Pkeycode 81 = q Q atkeycode 82 = r Rkeycode 83 = s Skeycode 84 = t Tkeycode 85 = u Ukeycode 86 = v