//Sets the default value on clur and removes if on focus
//obj_id - identifier on famin input
//the hidden input with the default value must have id="<obj_id>_default"
//flag = true on focus, false on blur.
function FocusInput(obj_id, flag)
{
	js_obj 		= document.getElementById(obj_id);
	js_obj_def 	= document.getElementById(obj_id+'_default');
	if(!js_obj || !js_obj_def)
		return;
	if(flag)
	{
		if(js_obj.value == js_obj_def.value)
			js_obj.value = "";
	}
	else
	{
		if(js_obj.value == "")
			js_obj.value = js_obj_def.value;
	}
}