function top_image(){ 
 
 img = new Array(); 
 img[0] = "images/index_ph001.jpg"; 
 img[1] = "images/index_ph002.jpg";
 img[2] = "images/index_ph003.jpg";
	img[3] = "images/index_ph004.jpg";

 kazu = img.length; 
 i = Math.floor(Math.random()*kazu); 
 
 
 if(i==0){
		document.write("<p><img src=\""+img[i]+"\" alt=\"\"+ usemap=\"\#Map\" /><p>");
}
 if(i==1) {document.write("<p><img src=\""+img[i]+"\" alt=\"\"+ usemap=\"\#Map\" /><p>"); }
 if(i==2) {document.write("<p><img src=\""+img[i]+"\" alt=\"\"+ usemap=\"\#Map\" /><p>"); }
else if(i==3) {document.write("<p><img src=\""+img[i]+"\" alt=\"\"+ usemap=\"\#Map\" /><p>"); }
}