var image = new Array();

image[0] = 'img_chilenut/randomTop/top_01.jpg' ;
image[1] = 'img_chilenut/randomTop/top_02.jpg' ;
image[2] = 'img_chilenut/randomTop/top_03.jpg' ;
image[3] = 'img_chilenut/randomTop/top_04.jpg' ;
image[4] = 'img_chilenut/randomTop/top_05.jpg' ;
image[5] = 'img_chilenut/randomTop/top_06.jpg' ;
image[6] = 'img_chilenut/randomTop/top_07.jpg' ;
image[7] = 'img_chilenut/randomTop/top_08.jpg' ;
image[8] = 'img_chilenut/randomTop/top_09.jpg' ;
image[9] = 'img_chilenut/randomTop/top_10.jpg' ;
image[10] = 'img_chilenut/randomTop/top_11.jpg' ;
image[11] = 'img_chilenut/randomTop/top_12.jpg' ;
image[12] = 'img_chilenut/randomTop/top_13.jpg' ;
image[13] = 'img_chilenut/randomTop/top_14.jpg' ;
image[14] = 'img_chilenut/randomTop/top_15.jpg' ;
image[15] = 'img_chilenut/randomTop/top_16.jpg' ;
image[16] = 'img_chilenut/randomTop/top_17.jpg' ;
image[17] = 'img_chilenut/randomTop/top_18.jpg' ;
image[18] = 'img_chilenut/randomTop/top_19.jpg' ;
image[19] = 'img_chilenut/randomTop/top_20.jpg' ;


var index = Math.floor(Math.random() * image.length);
document.write('<style type="text/css"> #randomTop { background-image: url('+ image[index] +') } </style>');