function f_count() {
    var tip=navigator.appName;
	
    var txt=document.forms['registration'].elements['experience'].value;
	var len=txt.length;
	if (len>299) {
	  txt=txt.substring(0,299);
	  document.forms['registration'].elements['experience'].value=txt;
	  len=300;
	}
	if (len==300)
	  document.forms['registration'].elements['count'].value=0;
	else
	  document.forms['registration'].elements['count'].value=299-len;
  }