function equalizeColumns(c1,c2,c3,c4) {
		
		if(c1 == null || c2 == null) exit();
		
		var h1,h2,h3,h4;
		h1 = window.document.getElementById(c1);
		h2 = window.document.getElementById(c2);
		if(c3 != null) h3 = window.document.getElementById(c3);
		if(c4 != null) h4 = window.document.getElementyById(c4);
	
		var high = Math.max(h1.offsetHeight,h2.offsetHeight);
		if(h3 != null) high = Math.max(high,h3.offsetHeight);
		if(h4 != null) high = Math.max(high,h4.offsetHeight);		

		var change = new Array();
		if(h1.offsetHeight != high) change.push(h1);
		else if (h2.offsetHeight != high) change.push(h2);
		else if (h3 != null && h3.offsetHeight != high) change.push(h3);
		else if (h4 != null && h4.offsetHeight != high) change.push(h4);
		
		if(change.length > 0) {
			for(k=0;k<change.length;k++) {
				var t = '';
				change[k].style.height = t.concat(high).concat('px');
			}
		}
	}