Configurable products, make first dropdown option selected by default -- does not work with configurable swatches, only default configurable dropdown.

dropdownSelect.php

<script>
//we create new function
 
spConfig.setInitialState = function(dropdown_id) {
 
	//select dropdown
	 
	var dropdown = $(dropdown_id);
	//remove empty option from dropdown so it is not selectable after initial selection
	 
	dropdown[0].remove();
	//change selections in dropdowns
	for(index = 0; index < dropdown.length; index++) {
	 
		if(dropdown[index].value != "") {
		
			dropdown.selectedIndex = index;
			 
			var element = dropdown;
			var event = 'change';
			 
			//fire events
			if(document.createEventObject) {
			 
				var evt = document.createEventObject();
				return element.fireEvent('on'+event,evt);
				
			} else {
			 
				var evt = document.createEvent("HTMLEvents");
				evt.initEvent(event, true, true );
				return !element.dispatchEvent(evt);
				
			}
		}
	}
 
};
 
<?php foreach($_attributes as $_attribute): ?>
spConfig.setInitialState("attribute<?php echo $_attribute->getAttributeId() ?>")
<?php endforeach; ?>
</script>