rotate_image = new Image	
		var show
		var previous
		var next
		var navImages = new Array("cumc_clinical_2.jpg","cumc_clinical_1.jpg","cumc_clinical.jpg","cumc_clinical_3.jpg","cumc_clinical_4.jpg", "cumc_clinical_5.jpg", "cumc_people_1.jpg", "cumc_people.jpg","cumc_people_3.jpg","cumc_people_2.jpg","cumc_clinical_campus.jpg","cumc_campus.jpg");
		var numImgs=navImages.length;
		var ran_number = Math.floor(Math.random() * numImgs);