function drawDot(x,y,color,size)
{
var string3="<table border='0' cellspacing=0 cellpadding=0><tr>";
string3+="<td style='position: absolute; left: "+x+"; top: "+y+";background-color: "+color+"' width="+size+" height="+size+"></td></tr></table>";
// document.write(string3);
document.getElementById("obj"

.innerHTML += string3;
}