Array.prototype.sum = function(){
		for(var i=0,sum=0;i<this.length;sum+=this[i++]);
		return sum;
	}
	Array.prototype.max = function(){
		return Math.max.apply({},this)
	}
	Array.prototype.min = function(){
		return Math.min.apply({},this)
	}
	function main_getObj(name) {
		if (document.getElementById) {
			return document.getElementById(name);
		} else if (document.all) {
			return document.all[name];
		} else if (document.layers) {
			return document.layers[name];
		}
		else return false;
	}	
    /* ***** */
	function main_div_resizer () {
		var s = [800];
		divs = ['div_main_leftside', 'div_main_center', 'div_main_rightside'];
		for (e in divs) {
			obj = main_getObj (divs[e]);
			if (obj) {
				s.push(obj.offsetHeight); 
			}
		}
		var smax = s.max();
		for (e in divs) {
			obj = main_getObj (divs[e]);
			if (obj && obj.offsetHeight<smax) { obj.style.height = smax; }
		}
		var o_info = main_getObj('txt_pageinfo_1');	if (o_info) { o_info.value = s.join(', '); }
		o_info = main_getObj('txt_pageinfo_2');	if (o_info) { o_info.value = s.join(', '); }
	}
	setInterval("main_div_resizer()",2000);