Dropdown Selection

Hi

Can any one help me with this code, i'm trying to get on dropdown menu to just set the dropdown 1 to the text of dropdown 2 but i can't work out the code, dose anyone know it?

	$("#elm_out_of_stock_actions").change(function() { 
		$("#feature_71 option:contains("+ $("#elm_out_of_stock_actions option:selected").text() +")").attr('selected', true);
	});