function OpenMenu(id){ 
	document.getElementById( id ).style.display = 'block';
	
	
	var elements_body = document.getElementsByTagName('body');
	if(elements_body[0].getAttribute('className') != null){
		now_category = elements_body[0].getAttribute('className')
	}else{
		now_category = elements_body[0].getAttribute('class')
	}

	if(id == "pull_down1"){
		if(now_category != "category_service" ){
			ele = document.getElementById('bt_service').getElementsByTagName('a');
			ele[0].style.backgroundPosition = '0px -56px'; 
		}
	}else if(id == "pull_down5"){
		if(now_category != "category_support" ){
			ele = document.getElementById('bt_support').getElementsByTagName('a');
			ele[0].style.backgroundPosition = '0px -56px'; 
		}
	}
	
}
function CloseMenu(id){ 
	document.getElementById( id ).style.display = 'none';
	
	
	
	if(id == "pull_down1"){
		if(now_category != "category_service" ){
			ele = document.getElementById('bt_service').getElementsByTagName('a');
			ele[0].style.backgroundPosition = '0px 0px'; 
		}
	}else if(id == "pull_down5"){
		if(now_category != "category_support" ){
			ele = document.getElementById('bt_support').getElementsByTagName('a');
			ele[0].style.backgroundPosition = '0px 0px'; 
		}
	}
}