function checkbox_all(form){
for(i=0;i<=form.elements.length-1;i++) {
if (form.elements[i].type=='checkbox') form.elements[i].checked=true;
}
}
function checkbox_none(form){
for(i=0;i<=form.elements.length-1;i++) {
if (form.elements[i].type=='checkbox') form.elements[i].checked=false;
}
}
function checkbox_invert(form){
for(i=0;i<=form.elements.length-1;i++) {
if (form.elements[i].type=='checkbox') form.elements[i].checked=form.elements[i].checked ? false : true;
}
}
function form_blank_action(form, action_new, action_old){
form.target='_blank';
form.action.value=action_new;
form.submit();
form_name=form.name;
window.setTimeout('document.'+form_name+'.target=""; document.'+form_name+'.action.value="'+action_old+'";', 2000);
}
function helpwin(url){
myhelpwin=window.open(url,"","width=500,height=400,scrollbars=yes,resizable=yes");
return false;
}