trouble with SWITCH javascript always executing default case -

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well have trouble , ive been dealing cant work

i have function 

function getdirections(dir) { var img; switch(dir)     {     case 0:     img+='n.png';     break;       case 1:     img+='ne.png';     break;     case 2:     img+='e.png';     break;     case 3:     img+='se.png';     break;     case 4:     img+='s.png';     break;     case 5:     img+='so.png';     break;     case 6:      img+='o.png';     break;     case 7:     img+='no.png';     break;     default:     alert('enetered default direction='+dir);     } return img; }

quite simple right? have interval set 5000 ms call getdirections(variable), function works first time called after , enter in default clause , alerts 'entered default direction=dirvalue' , mean if dir value between 0-7 enter default: alert value supossed enter 1 of cases.

i made same using else if , worked dont know wrong switch

if(dir==0){img+='n.png';} else if(dir==1){img+='ne.png';} else if(dir==2){img+='e.png';} else if(dir==3){img+='se.png';} else if(dir==4){img+='s.png';} else if(dir==5){img+='so.png';} else if(dir==6){img+='o.png';} else if(dir==7){img+='no.png';}

that weird... try make sure dir int, before switch:

dir = parseint(dir);

if alert shows value correctly should enter switch, still can "look" correct of different data type. conversion manually ensure it's int


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