var currentLayer = 'comment1';

function showLayer(lyr){
	hideLayer(currentLayer);
	document.getElementById(lyr).style.visibility = 'visible';
	document.getElementById(lyr).style.position = 'relative';
	currentLayer = lyr;
}

function hideLayer(lyr){
	document.getElementById(lyr).style.visibility = 'hidden';
	document.getElementById(lyr).style.position = 'absolute';
}

function showLogin(){
	document.getElementById('formLinkDiv').style.visibility = 'hidden';
	document.getElementById('formLinkDiv').style.position = 'absolute';
	document.getElementById('formDiv').style.visibility = 'visible';	
	document.getElementById('formDiv').style.position = 'relative';
}

// set the radio button with the given value as being checked
// do nothing if there are no radio buttons
// if the given value does not exist, all the radio buttons
// are reset to unchecked
function setCheckedValue(radioObj, newValue) {
	if(!radioObj)
		return;
	var radioLength = radioObj.length;
	if(radioLength == undefined) {
		radioObj.checked = (radioObj.value == newValue.toString());
		return;
	}
	for(var i = 0; i < radioLength; i++) {
		radioObj[i].checked = false;
		if(radioObj[i].value == newValue.toString()) {
			radioObj[i].checked = true;
		}
	}
}

function getWidth(setwidth) {
	num = document.images.length;
	for (i = 0; i <= num; i++){
		var obj = document.images[i];
		x=obj.width;
		y=obj.height;
		xn=setwidth;
		y=y*xn/x;
		if(x>setwidth && obj.className == 'mainImage'){
			obj.style.width=xn+"px";
			obj.style.height=y+"px";
		}
	}
}