Incident to Catalog Item conversion

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
	if (isLoading || newValue == '') {
		return;
	}
	
	//Type appropriate comment here, and begin script below
	conversionDialog();
	
	function conversionDialog() {
		//Get the values to pass into the dialog
		var requester = g_form.getReference('u_requester');
		
		var gr = new GlideRecord('sc_cat_item');
		if (gr.get(g_form.getReference('u_category').u_catalog_item)) {
			var item = gr.name;
		}
		
		//Initialize and open the dialog
		var dialog = new GlideDialogWindow("conversion_dialog"); //Instantiate the dialog containing the UI Page 'add_comments_dialog'
		dialog.setTitle("Ticket Conversion"); //Set the dialog title
		
		dialog.setPreference("catalog_item", item); //Pass the item name to the dialog
		dialog.render(); //Open the dialog
	}
}