pic1 = document.getElementById("hf1").value;
pic2 = document.getElementById("hf2").value;
pic3 = document.getElementById("hf3").value;    
image_list = new Array();
image_list[image_index++] = new imageItem(pic1);
image_list[image_index++] = new imageItem(pic2);
image_list[image_index++] = new imageItem(pic3);
var number_of_image = image_list.length;