function validate(form) {
    if (form.email.value=="") {
        alert("Please provide a valid email address");
        form.email.focus();
        return false;
    }

	var emailID=form.email;
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please provide a valid email address")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
}
function echeck(str) {
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
		alert("Please provide a valid email address")
		return false
	}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		alert("Please provide a valid email address")
		return false
	}
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		alert("Please provide a valid email address")
		return false
	}
	if (str.indexOf(at,(lat+1))!=-1){
		alert("Please provide a valid email address")
		return false
	}
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		alert("Please provide a valid email address")
		return false
	}
	if (str.indexOf(dot,(lat+2))==-1){
		alert("Please provide a valid email address")
		return false
	}
	if (str.indexOf(" ")!=-1){
		alert("Please provide a valid email address")
		return false
	}
	return true
}