function validate_input() {
    if(document.qForm.entered_question.value == "")
    {
    	alert("Please enter a question.");
    	document.qForm.entered_question.focus();
    	return false;
    }
    if (validate_qSize() == false)
    {
        return false;
    }
    if(document.qForm.email.value == ""){
	alert("Please enter a emailid.");
    	document.qForm.email.focus();
    	return false;
	}
    if(echeck(document.qForm.email.value)==false){
	return false;
	}
    return true;
}


function validate_qSize() {
    var maxSize = 4000;
    if (document.qForm.entered_question.value.length > maxSize) {
        alert("The question field is limited to " + maxSize + " characters.");
        document.qForm.entered_question.value = document.qForm.entered_question.value.substring(0,maxSize-1);
        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("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}