function changeClass(idname, classname) { // by Micha³ 'REGi' Rygielski http://regi.gamedev.pl
  class_ = document.getElementById(idname);
  class_.setAttribute("class", classname);
  class_.setAttribute("className", classname);
}
function changeBgTable(id, color, cursor) {
  document.getElementById(id).style.background=color;
  document.getElementById(id).style.cursor=cursor;
}
function check_email(e) {
ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";

for(i=0; i < e.length ;i++){
if(ok.indexOf(e.charAt(i))<0){ 
return (false);
}	
} 

if (document.images) {
re = /(@.*@)|(\.\.)|(^\.)|(^@)|(@$)|(\.$)|(@\.)/;
re_two = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
if (!e.match(re) && e.match(re_two)) {
return (-1);		
} 

}

}