function StringBuffer() { this.buffer = []; } 
StringBuffer.prototype.append = function(string) 
{ 
this.buffer.push(string); 
return this; 
} 

StringBuffer.prototype.toString = function()
{ 
return this.buffer.join(""); 
}

var sb = new StringBuffer();
sb.append("<table border=0 width=100%>");
sb.append("<tr><td align='center' style='font-size:30px; font-weight:bold;color:white'>Landelijk Katholiek Reumacentrum</td></tr>");
sb.append("</table>");
//alert(sb.toString());

document.write(sb.toString())