function file_tab()
{
	document.getElementById('file').style.display="block";
	document.getElementById('edit').style.display="none";
	document.getElementById('view').style.display="none";
	document.getElementById('insert').style.display="none";
	document.getElementById('h_file').style.backgroundColor="#ffffff";
	document.getElementById('h_edit').style.backgroundColor="transparent";
	document.getElementById('h_view').style.backgroundColor="transparent";
	document.getElementById('h_insert').style.backgroundColor="transparent";
}
function edit_tab()
{
	document.getElementById('file').style.display="none";
	document.getElementById('edit').style.display="block";
	document.getElementById('view').style.display="none";
	document.getElementById('insert').style.display="none";
	document.getElementById('h_file').style.backgroundColor="transparent";
	document.getElementById('h_edit').style.backgroundColor="#ffffff";
	document.getElementById('h_view').style.backgroundColor="transparent";
	document.getElementById('h_insert').style.backgroundColor="transparent";
}
function view_tab()
{
	document.getElementById('file').style.display="none";
	document.getElementById('edit').style.display="none";
	document.getElementById('view').style.display="block";
	document.getElementById('insert').style.display="none";
	document.getElementById('h_file').style.backgroundColor="transparent";
	document.getElementById('h_edit').style.backgroundColor="transparent";
	document.getElementById('h_view').style.backgroundColor="#ffffff";
	document.getElementById('h_insert').style.backgroundColor="transparent";
}
function insert_tab()
{
	document.getElementById('file').style.display="none";
	document.getElementById('edit').style.display="none";
	document.getElementById('view').style.display="none";
	document.getElementById('insert').style.display="block";
	document.getElementById('h_file').style.backgroundColor="transparent";
	document.getElementById('h_edit').style.backgroundColor="transparent";
	document.getElementById('h_view').style.backgroundColor="transparent";
	document.getElementById('h_insert').style.backgroundColor="#ffffff";
}