//function to Check Empty
    function IsEmpty(fld,mesg)
    {
		reg = / /g;
        str = fld.value;
        
		res = str.replace(reg,""); 
       
		if(res == "")
        {
            
			alert(mesg);
            fld.value="";

            return false;
        }		
        return true;
    }
	//function to Check email
    // opt value 0 if mandatory and 1 if not
    function CheckEmail(fld,msg,opt)
    {
    	if(opt=="0" || fld.value!="")
    	{
            var emailStr=fld.value;
        	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)
        	{
        		
                fld.focus();
        		fld.select();
        		alert(msg);
        		return false;
        	}
            
        	var user=matchArray[1];
        	var domain=matchArray[2];
    
        	for (i=0; i<user.length; i++) 
            {
            	if (user.charCodeAt(i)>127) 
                {
                	fld.focus();
                	fld.select();
                	alert(msg);
                	return false;
        	    }
        	}
    	
            for (i=0; i<domain.length; i++) 
            {
            	if (domain.charCodeAt(i)>127) 
                {
                	fld.focus();
                	fld.select();
                	alert(msg);
                	return false;
            	}
        	}
    
        	// See if "user" is valid 
        
        	if (user.match(userPat)==null) 
            {
        
        	// user is not valid
        	fld.focus();
        	fld.select();
        	alert(msg);
        	return false;
        	}
        
        	var IPArray=domain.match(ipDomainPat);
        	if (IPArray!=null) 
        	{
            	for (var i=1;i<=4;i++) 
                {
                	if (IPArray[i]>255) 
                    {
                    	fld.focus();
                    	fld.select();
                    	alert(msg);
                    	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) 
                {
                	fld.focus();
                	fld.select();
                	alert(msg);
                	return false;
            	}
        	}
    
        	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) 
            {
            	fld.focus();
            	fld.select();
            	alert(msg);
            	return false;
        	}
    
        	if (len<2) 
            {
            	fld.focus();
            	fld.select();
            	alert(msg);
            	return false;
        	}
    	    return true;
        }
        return true;
    }
/**
 * Rollover buttons
 */
 function CheckMail(emailStr)
{
	var checkTLD=0;
	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)
	{
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];

	for (i=0; i<user.length; i++)
	{
		if (user.charCodeAt(i)>127)
		{
			return false;
		}
	}

	for (i=0; i<domain.length; i++)
	{
		if (domain.charCodeAt(i)>127)
		{
			return false;
		}
	}

	if (user.match(userPat)==null)
	{
		return false;
	}

	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)
		{
			return false;
		}
	}

	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1)
	{
		var dis=domArr[domArr.length-1].length;
		return false;
	}

	if (len<2)
	{
		return false;
	}
	return true;
}