var ad = Math.round(Math.random() * 1);
ad +=1;
if (ad==1) {
url="<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab #version=7,0,0,0' width='120'  height='90'>   <param name=movie value='http://rc-aviation.ru/swf_baner/120x90_rca_potol.swf' />   <param name='wmode' value='transparent' />   <param name='play' VALUE='true' />   <param name='loop' VALUE='true' />   <param name='quality' value='low' />   <embed src='http://rc-aviation.ru/swf_baner/120x90_rca_potol.swf' quality='high' wmode='transparent'  pluginspage='http://www.macromedia.com/go/getflashplayer' type='application/x-shockwave-flash' width='160' height='120'></embed></object> "; 
}
if (ad==2) {
url="<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab #version=7,0,0,0' width='120'  height='90'>   <param name=movie value='http://rc-aviation.ru/swf_baner/120x90_rca_potol.swf' />   <param name='wmode' value='transparent' />   <param name='play' VALUE='true' />   <param name='loop' VALUE='true' />   <param name='quality' value='low' />   <embed src='http://rc-aviation.ru/swf_baner/120x90_rca_potol.swf' quality='high' wmode='transparent'  pluginspage='http://www.macromedia.com/go/getflashplayer' type='application/x-shockwave-flash' width='160' height='120'></embed></object> "; 
}

document.write('<center>');
document.write(url);
document.write('</center>');