//Ǹ޴ over
function setImage(){

    var img_tmp = event.srcElement;

    if(img_tmp.tagName == "A"){
        img_tmp = img_tmp.childNodes[0];
    }
    
    if(img_tmp.src.lastIndexOf("_ovr") != -1){
        img_tmp.src = img_tmp.src.replace("_ovr.gif", ".gif");
    }else{
        img_tmp.src = img_tmp.src.replace(".gif", "_ovr.gif");
    }
}


//main research
function when_poll_prc(form){
    
    answ     = form.answ_1;
    answ_cnt = answ.length;

    var checked = false;

    for(i=0; i<answ_cnt; i++){
        if(answ[i].checked){
            checked = true;
            break;
        }
    }

    if(!checked){
        alert("네개의 보기중 하나를 선택해 주십시요.");
        return false;
    }
    
}