function clear_text_box(field_name)
{	
	window.document.main_form.elements[field_name].value = ""
	return false
}


function update_datetime(field_name)
{	
	var datetime_value = ""
	
	datetime_value += window.document.main_form.elements[field_name + '_' + 'Century'].value
	datetime_value += window.document.main_form.elements[field_name + '_' + 'Year'].value
	datetime_value += "-"
	datetime_value += window.document.main_form.elements[field_name + '_' + 'Month'].value
	datetime_value += "-"
	datetime_value += window.document.main_form.elements[field_name + '_' + 'Day'].value
	datetime_value += " "
	datetime_value += window.document.main_form.elements[field_name + '_' + 'Hour'].value
	datetime_value += ":"
	datetime_value += window.document.main_form.elements[field_name + '_' + 'Minute'].value
	
	window.document.main_form.elements[field_name].value = datetime_value
}


function open_image_window(href)
{
	var features
	features = "channelmode=yes"
	features += ", "
	features += "scrollbars=yes"
	new_win = window.open(href, '_blank', features)
	return false
}


function open_image_window_original(href)
{
	var features
	features = "menubar=no"
	features += ", "
	features += "scrollbars=yes"
	features += ", "
	features += "height=560"
	features += ", "
	features += "width=780"
	features += ", "
	features += "top=20"
	features += ", "
	features += "left=20"	
	new_win = window.open(href, '_blank', features)
	return false
}


function open_login_window(href)
{
	var features
	features = "menubar=no"
	features += ", "
	features += "scrollbars=yes"
	features += ", "
	features += "height=300"
	features += ", "
	features += "width=400"
	features += ", "
	features += "top=200"
	features += ", "
	features += "left=200"
	new_win = window.open(href, '_blank', features)
	return false
}