function changePic(prid, pic)
{
document.getElementById('pic'+pic+'_'+prid).className = 'pic'+pic+'_choose_hover';
for(i = 1; i < 4; i++)
{
if(i != pic)
{
var tmp_el = document.getElementById('pic'+i+'_'+prid);
if(tmp_el) tmp_el.className = 'pic'+i+'_choose';
}
}

document.getElementById('curr_pic_'+prid).innerHTML = document.getElementById('hid'+pic+'_'+prid).innerHTML;

}