JavaScript that controls the player does not work in Safari

Hello everyone
I have a page with an embedded video on Windows media player, and
developed a javascript to control the video, only for Firefox, Safari
and Google Chrome.

The parties that control the play, stop, pause, volume, and fast
reverse fast forward work very well, but when I put a function that
advances the video marks the next and previous does not work in Safari
and in Google Chrome only works in Firefox and the worst and does not
accuse me errors simply does not work, then I do not know what to do
if someone can help me would greatly appreciate it
The codes are below

Code for embedded player


<div id="Dvideo" style="position:absolute; width:400px; height:266px;
z-index:3; visibility:hidden; left: 14px; top: 85px;">
<object
id="contentPlayer"
name="contentPlayer"
width="400"
height="266"
type="application/x-ms-wmp">

<param name="AnimationAtStart" value="0" />
<param name="AutoStart" value="0" />
<param name="CurrentMarker" value="0" />
<param name="EnablePositionControls"
value="true" />
<param name="EnableTracker" value="0" />
<param name="ShowAudioControls" value="0" />
<param name="ShowCaptioning" value="0" />
<param name="ShowControls" value="1" />
<param name="ShowDisplay" value="0" />
<param name="ShowGotoBar" value="0" />
<param name="ShowPositionControls"
value="0" />
<param name="ShowStatusBar" value="0" />
<param name="ShowTracker" value="0" />
<PARAM NAME="EnableContextMenu"
VALUE="false">
<param name="AllowChangeDisplaySize"
value="true" />
<PARAM NAME="CurrentPosition"
VALUE="false">
<param name="SRC" value="video.wmv" />
<param name="TransparentAtStart" value="1" /
>
<param name="uiMode" value="none"/>
<embed
src="video.wmv"
width="400"
height="266"
autostart="0"
type="application/x-ms-wmp"
id="contentPlayer"
name="contentPlayer"
showdisplay="0"
showcontrols="1"
animationatstart="0"
transparentatstart="1"
showstatusbar="0"
showtracker="0"
currentmarker="0"
CurrentPosition="0"
enablepositioncontrols="true"
enabletracker="0"
showcaptioning="0"
showaudiocontrols="0"
showgotobar="0"
EnableContextMenu="false"
AllowChangeDisplaySize="true"
uiMode="none"
showpositioncontrols="0"></embed>
</object>
</div>

javascript code




function play()
{
var player=document.getElementById('contentPlayer');
document.getElementById('DInfo').style.visibility = 'hidden'
document.getElementById('Dvideo').style.visibility = 'visible'
player.controls.play();


}

function pause()
{
var player=document.getElementById('contentPlayer');
player.controls.pause();

}

function stop()
{
var player=document.getElementById('contentPlayer');
document.getElementById('DInfo').style.visibility =
'visible'
document.getElementById('Dvideo').style.visibility = 'hidden'
player.controls.stop();

}
function Volume()
{
document.getElementById('contentPlayer').settings. volume =
document.getElementById('contentPlayer').settings. volume + 30 ;
}

function VolumeDown()
{
document.getElementById('contentPlayer').settings. volume =
document.getElementById('contentPlayer').settings. volume - 30 ;
}


function mute() {

var player = document.getElementById('contentPlayer');
var mutebutton = document.getElementById('bt4');

if (player.settings.mute) {
player.settings.mute = false;
return player.settings.volume + "%";
mutebutton.src ="../images/mute_false.gif";

} else {
player.settings.mute = true;
return "mute";
mutebutton.src ="../images/mute_true.gif";

}
}

function fastforward()
{
var player=document.getElementById('contentPlayer');
player.controls.fastForward();

}

function fastreverse()
{
var player = document.getElementById('contentPlayer');
player.controls.fastReverse();

}

function GoNextMarker (mymark)

{
var player = document.getElementById('contentPlayer');
var mymark = player.controls.currentMarker + 1
player.controls.currentMarker = mymark;


}

function GoPreviusMarker (mymark)

{
var player = document.getElementById('contentPlayer');
var mymark = player.controls.CurrentMarker - 1
player.controls.currentMarker = mymark;


}