// JavaScript Document
function topchannel(a){
	for(i=1;i<=4;i++){
		if(i==a){
			document.getElementById('topchannel_'+i).style.display="block";
			document.getElementById('topchannel_ImgL_'+i).style.backgroundImage="url('../images/channelH_curve1.gif')";
			document.getElementById('topchannel_ImgR_'+i).style.backgroundImage="url('../images/channelH_curve2.gif')";
			document.getElementById('topchannel_ImgH_'+i).style.backgroundImage="url('../images/channelH_bg.gif')";
			document.getElementById('topchannel_ImgH_'+i).className="channelOn";			
		}
		else{
			document.getElementById('topchannel_'+i).style.display="none";
			document.getElementById('topchannel_ImgL_'+i).style.backgroundImage="url('../images/channel_bg.gif')";
			document.getElementById('topchannel_ImgR_'+i).style.backgroundImage="url('../images/channel_bg.gif')";
			document.getElementById('topchannel_ImgH_'+i).style.backgroundImage="url('../images/channel_bg.gif')";
			document.getElementById('topchannel_ImgH_'+i).className="channelOff";
		}
	}	
}