function changeStyle( len, currentNum, idValue,contentId,stateValue){
	
	if( idValue != "" && stateValue != ""){
		for( var i = 0; i < len; i++ ){
			var currentId = idValue + i;
			if( currentNum == i ){
				document.getElementById(currentId).className=stateValue;
			}
			else{
				document.getElementById(currentId).className="";
			}
		}
	}
	
	if(contentId!=""){
		for( var i = 0; i < len; i++ ){
			var currentContentId = contentId + i;
			if( currentNum == i ){
				document.getElementById(currentContentId).style.display="block";
			}
			else{
				document.getElementById(currentContentId).style.display="none";
			}
		}
	}
}