function popup(url,id) 
{ 
    x = (800 - 700)/2, y = (600 - 450)/2;

    if (screen) {
        y = (screen.availHeight - 450)/2;
        x = (screen.availWidth - 700)/2;
    }

window.open(url,id,'width=700,height=450,resizable=yes,scrollbars=yes,left='+x+',top='+y+',screenX='+x+',screenY='+y+',status=yes'); 
} 

function alterNate(elm){
	if (!elm.base) elm.base = elm.value
	if (elm.value == elm.base) elm.value = "";
	else if (elm.value == "") elm.value = elm.base;
}