var subjectArray = new Array(

);

var categoryArray = new Array(

);

function Subject(id, desc){
this.id = id;
this.desc = desc;

}

function Category(id_subject, id, desc){
this.id = id;
this.id_subject = id_subject;
this.desc = desc;
}

function initCategories(sel_subject, sel_category){
for(i = 1; i <= subjectArray.length; i++){
document.contactUsForm.subject.options[i] = new Option(subjectArray[i-1].desc, subjectArray[i-1].id);
if(subjectArray[i-1].id == sel_subject){
document.contactUsForm.subject.options[i].selected = true;
}
}

OnSubjectChange(sel_category);
}

function OnSubjectChange(sel_subject){
sel_subject_index = document.contactUsForm.subject.selectedIndex;
sel_subject_value = document.contactUsForm.subject.value;

for(i = document.contactUsForm.category.length - 1; i > 0; i--){
document.contactUsForm.category.options[i] = null;
}

j=1;

for(i = 1; i <= categoryArray.length; i++){
if(categoryArray[i-1].id_subject == sel_subject_value){
document.contactUsForm.category.options[j]= new Option(categoryArray[i-1].desc, categoryArray[i-1].id);
if(categoryArray[i-1].id == sel_subject){
document.contactUsForm.category.options[j].selected = true;
}
j++;
}
}
}

/*
$(function(){
alert("Before init");
initCategories();
});*/