if (screen.width==800||screen.height==600) 
document.write("<table width='760' height='420' border='0' align='center' cellpadding='0' cellspacing='0' class='A'>");
else //se for outra resolução 
document.write("<table width='955' height='535' border='0' align='center' cellpadding='0' cellspacing='0' class='A'>");