var my_client = new UserClient( ) ;
var flash_version = 6 ;
var is_installed = false ;

if (my_client.opera && navigator.plugins["Shockwave Flash"]) {
	var sp = navigator.plugins["Shockwave Flash"].description.indexOf("Flash") ;
	var ep = navigator.plugins["Shockwave Flash"].description.lastIndexOf(" ") ;
	var usr_ver = parseFloat(navigator.plugins["Shockwave Flash"].description.substring(sp+6, ep)) ;
	if (usr_ver >= flash_version) {
		var is_installed = true ;
	}
}
else if (my_client.Win && my_client.ie) {
	document.write('<SCR' + 'IPT LANGUAGE=VBScript\> \n') ;
	document.write('on error resume next \n') ;
	document.write('contentVersion = 6 \n') ;
	document.write('is_installed = ( IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash." & contentVersion))) \n') ;
	document.write('</SCR' + 'IPT\> \n') ;
	if (my_client.ie4) {
		var is_installed = false ;
	}
}
else if (my_client.Mac && my_client.ie) {
	if (!my_client.ie4 && navigator.plugins["Shockwave Flash"]) {
		var sp = navigator.plugins["Shockwave Flash"].description.indexOf("Flash") ;
		var ep = navigator.plugins["Shockwave Flash"].description.lastIndexOf(" ") ;
		var usr_ver = parseFloat(navigator.plugins["Shockwave Flash"].description.substring(sp+6, ep)) ;
		if (usr_ver >= flash_version) {
			var is_installed = true ;
		}
	}
}
else if (my_client.nn && navigator.plugins["Shockwave Flash"]) {
	var sp = navigator.plugins["Shockwave Flash"].description.indexOf("Flash") ;
	var ep = navigator.plugins["Shockwave Flash"].description.lastIndexOf(" ") ;
	var usr_ver = parseFloat(navigator.plugins["Shockwave Flash"].description.substring(sp+6, ep)) ;
	if (usr_ver >= flash_version) {
		var is_installed = true ;
	}
}

function UserClient( ) {

	this.nav_name = navigator.appName ;
	this.nav_agnt = navigator.userAgent ;
	this.nav_ver = navigator.appVersion ;

	this.Win = (this.nav_agnt.indexOf("Win",0) != -1) ;
	this.Mac = (this.nav_agnt.indexOf("Mac",0) != -1) ;

	this.ie = (this.nav_name == "Microsoft Internet Explorer") ;
	this.ie4 = (this.nav_ver.indexOf('MSIE 4') > 0) ;
	this.nn = (this.nav_name == "Netscape") ;
	this.opera = (this.nav_agnt.indexOf("Opera", 0) != -1) ;
	this.safari = (this.nav_agnt.indexOf("Safari", 0) != -1) ;

}

<!-- hosing top -->

function index_flash() {
	if (is_installed) {
		document.write (
				'<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" ' +
				'codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" ' +
				'width="851" height="301">' +																//change here
				'<param name = "movie" value="img/top_flash.swf">' +											//change here
				'<param name = "quality" value="high">' +
				'<param name = "loop" value= "false">' +													//change here
				'<param name = "wmode" value= "transparent">' +												//change here
				'<embed src="img/top_flash.swf" width="851" height="301" loop = "false" ' +						//change here
				'quality="high" bgcolor="#FFFFFF"' +
				'type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>' +
				'</object>'
		) ;
	}
	else {
		document.write (
				'<img src="img/index_01.jpg" width="851" height="301" border="0" hspace="0" vspace="0" alt=""><br>'
		) ;
	}
}