function check_status(prefix)
{
	var keyboardStatus=MM_findObj(prefix+':keyboardStatus');
	if (keyboardStatus.value=='1')
	{
		hide_keyboard(prefix);
	}
	else
	{
		show_keyboard(prefix);
	}
}
function show_keyboard(prefix)
{
	prefix = prefix +':';	
	var keyboardStatus=MM_findObj(prefix+'keyboardStatus');
	keyboardStatus.value ='1';
	var dvKeyboard=MM_findObj(prefix+'dvKeyboard');
	dvKeyboard.style.backgroundColor ='#ffffff';	
	var imgKeyboard=MM_findObj(prefix+'imgKeyboard');
	imgKeyboard.src = 'image/keyboard-on.gif';		
				
	for(i=1;i<=60;i++)
	{
		var b=prefix+'a'+ i;
		var table=MM_findObj(b);
		if (table!=null)
			table.style.visibility='visible';
	}
}
function hide_keyboard(prefix)
{
	prefix = prefix +':';
	var keyboardStatus=MM_findObj(prefix+'keyboardStatus');
	keyboardStatus.value ='0';	
	var dvKeyboard=MM_findObj(prefix+'dvKeyboard');
	dvKeyboard.style.backgroundColor ='';		
	var imgKeyboard=MM_findObj(prefix+'imgKeyboard');
	imgKeyboard.src = 'image/keyboard.gif';		
	for(i=1;i<=60;i++)
	{
		var b=prefix+'a'+ i;
		var table=MM_findObj(b);
		if (table!=null)
			table.style.visibility='hidden';
	}
}
function hi_color(t)
{
	MM_findObj(t).style.background='B6D1E6'; 
}
function lo_color(t)
{
	MM_findObj(t).style.background='e3e3e3'; 
}
function setTextValue(prefix,s)
{
	var txt = MM_findObj(prefix+'_txtValue');
	if (txt!=null)
		txt.value= txt.value + s; 
}
function backspaceClick(prefix)
{
	var txt = MM_findObj(prefix+'_txtValue');
	if (txt!=null)
		txt.value = txt.value.substr(0, txt.value.length - 1);		
}