var isNav = (navigator.appName.indexOf("Netscape") != -1 );
var isIE  = (navigator.appName.indexOf("Microsoft") != -1 );

function emailCheck (emailStr) 
{
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	
	if (matchArray==null) {
		alert("Email address seems incorrect (check @ and .'s)");
		return false;
	}
	
	var user=matchArray[1];
	var domain=matchArray[2].toLowerCase();
	
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("The email contains invalid characters.");
			return false;
		}
	}

	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("The email domain name contains invalid characters.");
			return false;
		}
	}

	if (user.match(userPat)==null) {
		alert("The email doesn't seem to be valid.");
		return false;
	}

	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("The email destination IP address is invalid!");
				return false;
			}
		}
		return true;
	}
	
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			alert("The email domain name does not seem to be valid.");
			return false;
		}
	}

	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		alert("The email address must end in a well-known domain or two letter " + "country.");
		return false;
	}

	if (len<2) {
		alert("The email address is missing a hostname!");
		return false;
	}
	
	return true;
}


function isInteger(s){
 var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}
 

function  ValidateContact(tt)
{


	       if(tt.Uname.value== "" )		
		   {
			  
			alert("Enter Name");
		    tt.Uname.select();
		    tt.Uname.focus();
		   return false;
		   }
		   

	if(tt.Uemail.value=="")
	    	{
	    		alert("Enter Email Address")
				tt.Uemail.focus();
				return false
	    	}
	  	if (emailCheck(tt.Uemail.value)==false)
     		{
				tt.Uemail.select();
				tt.Uemail.focus();
				return false;
   	    	}

		if(tt.Uphone.value=="")
		    {
	    		alert("Enter Phone");
				tt.Uphone.focus();
				return false;
	    	}
			if(!isInteger(tt.Uphone.value))
		    {
	    		alert("Enter Correct Phone");
				tt.Uphone.select();
				tt.Uphone.focus();
				return false;
	    	}
			
		
			
			if(tt.Umsg.value=="" || tt.Umsg.value.length >500)
		    {
	    		alert("Message is emty OR exceeding limit of 500 letters");
				tt.Umsg.focus();
				return false;
	    	}		
			

return true;
}