var num = Math.floor((10-6)*Math.random())+1;

var flashvars = {};
var params = {};
params.flashvars = "principal"+num;
params.wmode = "transparent";
var attributes = {};
swfobject.embedSWF("../swf/head.swf", "head", "962", "294", "9.0.0", "swf/expressInstall.swf", flashvars, params, attributes);