var n_bytes = 52577;
var tstimg = new Image(50,50);

function calculate_upload_times( time_consumed ) {
	var download_speed_in_KBps = n_bytes / time_consumed * 1000 /*milliseconds*/ / 1024 /* bytes per k */;
	if(navigator.userAgent.indexOf("MSIE") != -1) {
		download_speed_in_KBps = download_speed_in_KBps / 10;
	}

	document.getElementById("timetext").value = Math.round(download_speed_in_KBps*8); // gets there in Kbps
}

function check_download( accum ) {
	if(tstimg.complete) {
		calculate_upload_times ( accum );
	}
	else {
		setTimeout("check_download( "+ (accum + 10) +" )", 10);
	}
}

var initial_time = (new Date()).getMilliseconds();
setTimeout("check_download( 10 )", 10);
var imgsrc = "http://www.compraventa.com/cgi/rnddata.cgi/" + Math.random() + ".jpg";
tstimg.src = imgsrc;

document.write("<div id='imgtime' style='display:none;text-align:center;width:100%;color:#f00;font-weight:bold'><br><input type=text id='timetext' style='width:100%;color:#f00;background-color:#ffffec;text-align:center;border: solid 1px #ffffec;font-weight:bold' value=''><a id=\"warning\" name=\"warning\">&nbsp;</a></div>\n");