function setTextInputValue(inputID,value) {
var element = document.getElementById(inputID);

if(element == undefined)
return;

element.setAttribute('value',value);
element.setAttribute ('clearedState','prefilled');
}
function clearTextInputValue(inputID) {
var element = document.getElementById(inputID);

if(element == undefined)
return;

var state = element.getAttribute('clearedState');
if (state == 'prefilled') {
element.setAttribute('value','');
element.removeAttribute('clearedState');
}
}
setTextInputValue('email1','write your email here');