var image_prefix 	= "images/interf_0";
var image_prefix2 	= "images/interf_hi_0";
var image_suffix 	= ".jpg";
var tagimage_prefix = "but";
var image_startat = 3;
var nb_boutons = 5;

var loading = nb_boutons * 2;
var b_o = new Array();
var b_i = new Array();
for(i=0;i<nb_boutons;i++){
	b_o[i] = new Image();
	b_o[i].onload = lc;
	b_o[i].src = image_prefix+(image_startat+i)+image_suffix;
	b_i[i] = new Image();
	b_i[i].onload = lc;
	b_i[i].src = image_prefix2+(image_startat+i)+image_suffix;
}
function lc(){ loading--;}
function ro(n){if(loading<=0) eval( tagimage_prefix+n+".src=b_o[" + n +"].src;");	}
function ri(n){if(loading<=0)	eval( tagimage_prefix+n+".src=b_i[" + n +"].src;");	}