var last='';
var ua = navigator.userAgent;


if (ua.indexOf("MSIE") >= 0) {
	browser = "ie";
} else {
	browser = "ns";
}
if (browser == "ns" && document.getElementById) {
	browser = "ns6";
}

function showM(elem)
{
	
	colbg="col"+elem;
//	hideM(last);
	switch(browser) {
		case "ie": 
			if (document.all[elem]){	
				document.all[elem].style.visibility = "visible";
			}
			break;
		case "ns":  
			if (document.layers[elem]){
				document.layers[elem].visibility = "show";
			}
			break;
		case "ns6": 
			if (document.getElementById(elem)){
				document.getElementById(elem).style.visibility = "visible";
			}
			break;
	}
	last=elem;
}

function hideM(last)
{
	switch(browser) {
		case "ie":
			if (document.all[last]){ 
				document.all[last].style.visibility = "hidden";
				}
				
			break;
		case "ns": 
			if (document.layers[last]){
				document.layers[last].visibility = "hide";
				}
			break;
		case "ns6": 
			if (document.getElementById(last)){
				document.getElementById(last).style.visibility = "hidden";
			}
			break;
	}
}