preload() 
 function preload(){ 
 f_name = new Array 
 file = new Array 

 f_name[1] = "materials/navi/print_b.gif" 
 f_name[2] = "materials/navi/prev_b.gif" 
 f_name[3] = "materials/navi/next_b.gif"
 
 var i 
 for(i = 1;f_name.length > i;i++) 
 {file[i] = new Image();file[i].src = f_name[i]} 
 }