if(navigator.appName.indexOf("Microsoft") > -1){
var canSee = 'block'
} else {
var canSee = 'table-row';
}
function showhide(rowstart,rowend,checkname){
	for(i=rowstart; i<=rowend; i++){
		which = document.getElementById('row'+i);
		//alert(which);
		if (checkname.checked == false) {
			which.style.display = 'none';
		}
		else {
			which.style.display = canSee;
		}
	}
}