function getElementsByClassName(classname) {
				var rl = new Array();
				var re = new RegExp('(^| )'+classname+'( |$)');
				var ael = document.getElementsByTagName('*');
				var op = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;
				if (document.all && !op) ael = document.all;
				for(i=0, j=0 ; i<ael.length ; i++) {
						if(re.test(ael[i].className)) {
							rl[j]=ael[i];
								j++;
						}
				}
				return rl;
		}

		function stessa_altezza(className) {
			cols = getElementsByClassName(className);

			var max = 0;
			
			for(var i=0; i<cols.length; i++) {
				if(cols[i].clientHeight > max) max = cols[i].clientHeight;
			}
			
			for(i=0; i<cols.length; i++) {
				cols[i].style.height = max + "px";
			}

			for(i=0; i<cols.length; i++) {
				if(cols[i].clientHeight > max) {
					offset = cols[i].clientHeight - max;
					cols[i].style.height = (parseInt(cols[i].style.height)) - offset + "px";
				}
			}

		}