JS Audio API Synth With Random Hertz And Duration Features!!

<body onload="chk4.checked=true;
Text1.value=Math.floor(Math.random()*100);
Text2.value=Math.floor(Math.random()*100);" bgcolor="lightblue"/>
<b>
<font color="darkblue">
<center>
Time:(Seconds)<br>
<input type="text" id="Text1" name="Text1" value="100">
<br>Frequency:<br>
<input type="text" id ="Text2" name="Text2" value="100">
<br>
<input type="checkbox" id="chk1" name="chk1" onclick="script:chk2.checked=false;
chk3.checked=false;
chk4.checked=false;"> Triangle
<input type="checkbox" id="chk2" name="chk2" onclick="script:chk1.checked=false;
chk3.checked=false;
chk4.checked=false;"> Square
<input type="checkbox" id="chk3" name="chk3" onclick="script:chk1.checked=false;
chk2.checked=false;
chk4.checked=false;"> Sine
<input type="checkbox" id="chk4" name="chk4" onclick="script:chk1.checked=false;
chk2.checked=false;
chk3.checked=false"> Saw
<br>
<b>
<button onclick="script:
var PlayLen=Text1.value;
var Freq=Text2.value;
var context = new AudioContext();
oscillator=context.createOscillator();
if(chk1.checked==true){
oscillator.type = 'triangle';
}
if(chk2.checked==true){
oscillator.type = 'square';
}
if(chk3.checked==true){
oscillator.type = 'sine';
}
if(chk4.checked==true){
oscillator.type = 'sawtooth';
}
oscillator.frequency.value = Freq;
oscillator.connect(context.destination);
oscillator.start(context.current);
oscillator.stop(PlayLen);
oscillator.disconnect(PlayLen);"><b><font color=darkblue>Play Sound</button>
<button onclick="script:
var PlayLen=Text1.value;
var Freq=Text2.value;
var context = new AudioContext();
oscillator=context.createOscillator();
if(chk1.checked==true){
oscillator.type = 'triangle';
}
if(chk2.checked==true){
oscillator.type = 'square';
}
if(chk3.checked==true){
oscillator.type = 'sine';
}
if(chk4.checked==true){
oscillator.type = 'sawtooth';
}
var var1=Math.floor(Math.random()*100);
var var2=Math.floor(Math.random()*100);
var PlayLen=var1
var Freq=Text1.var2;
Text1.value=var1;
Text2.value=var2;
oscillator.frequency.value = Freq;
oscillator.frequency.value = Freq;
oscillator.connect(context.destination);
oscillator.start(0);
oscillator.stop(PlayLen);
oscillator.disconnect(PlayLen);"><b><font color=darkblue>Gen Random</button>
<button onclick="script:
Text1.value='100';
Text2.value='100';
oscillator.stop(0);
oscillator.disconnect(context.destination);"><b><font color=darkblue>Stop Sound</button>
<button onclick="script:chk1.checked=false
chk2.checked=false
chk3.checked=false
chk4.checked=false
Text1.value='';
Text2.value='';"><font color=darkblue><b>Clear All</button>
</center>