function rollOver( imgName, imgSrc)
 {
 document[imgName].src='images/'+imgSrc+'.png'
 }
 
function toggle(){
	var el = document.getElementById('login')
	var el1 = document.getElementById('error_div');
	
		if (el.style.display == '') {
		el.style.display = 'block'
		el1.style.display = 'none'
	} else {
		el.style.display = ''
	}
}