function getElementsByClassName(classname, node) {
 if(!node) node = document.getElementsByTagName("body")[0];
      var a = [];
      var re = new RegExp('\\b' + classname + '\\b');
      var els = node.getElementsByTagName("*");
      for(var i=0,j=els.length; i<j; i++)
      if(re.test(els[i].className))a.push(els[i]);
      return a;
      }
	  
	  
function displayRows(){
	var rows = document.getElementsByClassName("second_form" );
	for (i = 0; i < rows.length; i++) {
        var row = rows[i];
			row.style.display = '';
	}
}

	  
function hideRows(){
	var rows = document.getElementsByClassName("second_form" );
	for (i = 0; i < rows.length; i++) {
        var row = rows[i];

			row.style.display = 'none';
	}
}