function chng(el) {

 tempColl = document.getElementsByTagName("DIV");
    for (i=0; i<tempColl.length; i++) {
      if (tempColl(i).className == "block_act") tempColl(i).className = "block";
    }
	
	tempColl = document.getElementsByTagName("a");
    for (i=0; i<tempColl.length; i++) {
      if (tempColl(i).className == "menu3_active") tempColl(i).className = "menu3";
    }
	
document.getElementById(el).className='block_act';
return this.className='menu3_active';
} ;

function cls(el) {
document.getElementById(el).className='block';
}

function ccc(el) {
 tempColl = document.getElementsByTagName("DIV");
    for (i=0; i<tempColl.length; i++) {
      if (tempColl(i).className == "block_act") tempColl(i).className = "block";
    }
	
	tempColl = document.getElementsByTagName("a");
    for (i=0; i<tempColl.length; i++) {
      if (tempColl(i).className == "menu3_active") tempColl(i).className = "menu3";
    }

}