function checkBlankField (txt){
var mint_txt = txt.length;
var mstr_txt = txt;
var mint_count = 0;
for (var iloop = 0; iloop<mint_txt; iloop++){
if (mstr_txt.charAt(iloop) == " "){
mint_count = mint_count+1;
}
}    
// if nothing entered in the field
if (txt == ""){
return false;
}
else if (mint_count == mint_txt){
return false;
}
return true;
}
				
function valid_email(eml){
	//declare the required variables
	var mint_len;
	var mstr_eml=eml;
	var mint_at=0;
	var mint_atnum=0;
	var mint_dot=0;
	var mint_dotnum=0;
	mint_len = eml.length; //takes the length of the email address entered
	//checking for the symbol single quote. If found replace it with its html code
	if (mstr_eml.indexOf("'")!=-1){	
		mstr_eml=mstr_eml.replace("'","'");
	}
	//checking for the (@) & (.) symbol
	for(var iloop=0;iloop<mint_len;iloop++){
		if(mstr_eml.charAt(iloop)=="@"){
			mint_at=iloop+1;
			mint_atnum=mint_atnum+1;
		}
		if(mstr_eml.charAt(iloop)=="."){
			mint_dot=iloop+1;
			mint_dotnum=mint_dotnum+1;
		}
	}
	//if nothing entered in the field
	if (mstr_eml==""){
		return true;
	}
	//if @ entered more than once & dot (.) entered more than 4 times
	else if((mint_atnum!=1)||(mint_dotnum>4)||((mint_dot-mint_at)<2)||((mint_len-mint_dot)<2)||(mint_at<3)){
		return true;
	}
	//if any blank space is entered in the email address
	else if (mstr_eml.indexOf(" ")!=-1){
		return true;
	}
	return false;
}			
function validate(myform)
{

if(checkBlankField(document.frm_contact.name.value) == false){
alert("Please enter the name.");
document.frm_contact.name.select();
return false
}
if(checkBlankField(document.frm_contact.email.value) == false){
alert("Please enter your e-mail.");
document.frm_contact.email.select();
return false
}
if(valid_email(document.frm_contact.email.value) == true){
alert("Please enter correct e-mail address.");
document.frm_contact.email.select();
return false
}
if(checkBlankField(document.frm_contact.phone.value) == false){
alert("Please enter the phone number.");
document.frm_contact.phone.select();
return false
}
if(checkBlankField(document.frm_contact.message.value) == false){
alert("Please enter the message.");
document.frm_contact.message.select();
return false
}
document.frm_contact.submit();  
}