          :

Code
<SCRIPT LANGUAGE="JavaScript">  
//Script by http://4UcoZ.Net.Ru
var down,cmin2,csec2;  

function Minutes(data) {  
for(var i=0;i<data.length;i++)        
if(data.substring(i,i+1)==':')        
break;        
return(data.substring(0,i));        
}  

function Seconds(data) {        
for(var i=0;i<data.length;i++)        
if(data.substring(i,i+1)==':')        
break;        
return(data.substring(i+1,data.length));        
}  

function Display(min,sec) {        
var disp;        
if(min<=9) disp=' 0';        
else disp=' ';        
disp+=min+':';        
if(sec<=9) disp+='0'+sec;        
else disp+=sec;        
return(disp);        
}  

function Down() {        
document.all.addcBut.style.display = 'none'; //   
cmin2='0'; //  
csec2='45'; //  
DownRepeat(); //   
}  

function DownRepeat() {        
csec2--;        
if(csec2==-1) {        
csec2=59; cmin2--;        
}        
document.all.timeNumer.innerHTML='<h1>'+Display(cmin2,csec2)+'</h1><font color="red">- </font>'; //    
if((cmin2==0)&&(csec2==0))        
{  
document.all.addcBut.style.display = 'block'; //    
document.all.timeNumer.innerHTML='<font color="green">   </font>'; //     
}  
else down=setTimeout('DownRepeat()',1000);        
}  
</SCRIPT>

     ( <div>  </div> )

Code
<div id="timeNumer"></div>

<input type="submit" onClick="Down()" class="commSbmFl" id="addcBut" name="submit" value="-   -">

  <BODY ... onLoad="Down()">
        (     ,       ,    ) 