function validate_submitsite_form()
{
 
	if(document.form1.Name.value.length <1)
	{
	alert("Your Name Can Not Be Blank.");
	document.form1.Name.focus();
	return false;
	}
	
	
			if(document.form1.Email.value.length<1)
	{
		alert("E-mail Address Can Not be Blank.");
		document.form1.Email.focus();
		return false;
	}
	
	
	if(document.form1.Country.value.length <1)
	{
	alert("Phone Can Not Be Blank.");
	document.form1.Country.focus();
	return false;
	}
	
	
	if (chkemail(document.form1.Email.value)==false)
	{
		document.form1.Email.focus();
		return false;
	}
	
	if(document.form1.Query.value.length <1)
	{
	alert("Please tell us your Query.");
	document.form1.Query.focus();
	return false;
	}


return true;
}




<!-- check email field function start -->
	function chkemail(varmail)
	{
	mail=new String();
	mail=varmail
	if (mail.length<1)
		{
			alert("Please enter e-mail address.");
			return false;
		}
		else
		{
		at_pos=mail.indexOf("@")
		dot_pos=mail.indexOf(".")
			if(at_pos<1 || dot_pos<1)
			{
			alert("Missing '@' and '.' in email address.")
			return false;
			}
			else
			{
			u=0;
			p=0;
				for(var i=0;i<mail.length;i++)
				{
					if ((mail.charCodeAt(i) >= 64 && mail.charCodeAt(i) <= 90)||(mail.charCodeAt(i) >= 97 && mail.charCodeAt(i) <= 122)||(mail.charCodeAt(i) >= 48 && mail.charCodeAt(i) <= 57)||(mail.charCodeAt(i)==95)||(mail.charCodeAt(i)==46))
					{
						if(mail.charAt(i)=="@")
						p=p+1
					}
					else
					{
					u=u+1
					}
				}

					if (p>1)
								{
								alert ("Email must have only one '@'")
								return false;
								}
								if (u>0)
								{
								alert ("Special Characters are not allowed")
								return false;
								}

								}
								}
								}
<!-- check email field function end -->		
						
<!-- check numric field function start   -->
	function chknum(varctr)
	{
		for(var i=0;i<varctr.length;i++)
		{
			if ((varctr.charCodeAt(i)<48) || (varctr.charCodeAt(i)>57))
			{
			return false;
			}
		}

	}