function setAlpha(modAlpha,idCmd){

	var alphaVal = Math.round(ById(idCmd).lang);

	if(modAlpha=='show'){
		ById(idCmd).style.display='block';
		if(alphaVal<100)
		{
			alphaVal+=20;
			setTimeout("setAlpha('"+modAlpha+"','"+idCmd+"');",20);
		}
	}else{
		if(alphaVal>0)
		{
			alphaVal-=20;
			setTimeout("setAlpha('"+modAlpha+"','"+idCmd+"');",20);
		}
		else
		{
			ById(idCmd).style.display='none';
		}
	}
	
	if(navigator.userAgent.indexOf('Safari')>-1){
		ById(idCmd).style.opacity=(Math.round(alphaVal)/100);
	}else if(navigator.userAgent.indexOf('Firefox')>-1){
		ById(idCmd).style.MozOpacity=(Math.round(alphaVal)/100);
	}else if(navigator.userAgent.indexOf('MSIE')>-1){
		ById(idCmd).style.filter='Alpha(opacity:'+alphaVal+')';
	}
		
	ById(idCmd).lang = alphaVal;
}