function ow(url,myWidth,myHeight,myWin,bars){
  if(!myWin   ) myWin='_blank';
  myWin=window.open( url,myWin,"resizable=yes,scrollbars="+bars+",width="+myWidth+",height="+myHeight);
  myWin.focus();
}
function cntStrLength(str){
  $('text_num').innerHTML = 100 - str.length;
}
function limitStrTextarea(target,maxlength) {
    if ( target.value.length > maxlength ) {
        target.value = target.value.substr(0,maxlength);
    }

    target.focus();
}