function check_login(control)
{
	var msg='';
	if(control.username.value.length<3)
		msg=msg+'Ten dang nhap phai lon hon 3 ky tu.\n'
	if(control.password.value.length<6)
		msg=msg+'Mat khau phai lon hon 5 ky tu.\n'		
	if(msg.length>0)
	{
		alert(msg);
		return false;		
	}
	return true;
}
function doscroll(element_name)
{
	control_id=document.getElementById(element_name);		
	if(control_id!=null)
	{
		var n=document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;
		if(n>100)
			control_id.style.top =n+10+'px';	
		else	
			control_id.style.top =100+'px';			
	}		
}	
window.onscroll=function()
{
	//doscroll('advertisemenleft');	
	//doscroll('advertisemenright');		
}
function do_filter_location(control)
{
	window.location=control.value;
}
function do_display_control(control_id)
{
	var id=document.getElementById(control_id);	

	if(id.style.display=='inline')
		id.style.display='none';
	else
		id.style.display='inline';
	return false;	
}


function do_post_form(form_id,result_function)
{
	var params='ajax=1';
	var i=0;
	for(i=0;i<form_id.elements.length;i++)
	{
		params=params+'&'+form_id.elements[i].name+'='+form_id.elements[i].value;
	}
	sendRequest(form_id.action,params,'post',result_function);				
}
var contact_form_id=0;
function do_send_contact(form_id)
{
	contact_form_id=form_id;
	do_post_form(form_id,do_contact_message);
	return false;	
}
function do_contact_message(data)
{
	contact_form_id.innerHTML=data;
}
function do_load_page(control)
{
	var params='ajax=1';
	var i=0;
	for(i=0;i<form_id.elements.length;i++)
	{
		params=params+'&'+form_id.elements[i].name+'='+form_id.elements[i].value;
	}
	sendRequest(form_id.action,params,'post',return_page_content);				
}
function return_page_content(data)
{
	document.getElementById('list_template').innerHTML=data;
}
function do_search(control)
{
	var condition='';
	
	condition='author='+control.author.value;	

	if((control.keyword.value!='- Any Keyword -')  && (control.keyword.value!=''));
		condition=condition+'&keyword='+control.keyword.value;		

	window.location=url_root+control.product.value+control.category.value+'index.php?'+condition;
	return false;	
}
function clearIn(control)
{
	control.value='';
}