var strControlName = "ctl00_ContentPlaceHolder1_";
    function CheckForm()
        {
            var strErrorMsg = "";
            if(isBlank(document.getElementById(strControlName+"txtName").value))
                {
                    strErrorMsg = "<li>Name is required.</li>";
                }
            if(isBlank(document.getElementById(strControlName+"txtEmail").value))
                {
                    strErrorMsg += "<li>Email-id is required.</li>";
                } 
            if(!isBlank(document.getElementById(strControlName+"txtEmail").value))
            {
                if(!validEmail(document.getElementById(strControlName+"txtEmail").value))
                    {
                        strErrorMsg += "<li>Email-id is invalid.</li>";
                    }
            }       
            if(isBlank(document.getElementById(strControlName+"txtAddress").value))
                {
                    strErrorMsg += "<li>Address is required.</li>";
                }  
            if(isBlank(document.getElementById(strControlName+"txtComments").value))
                {
                    strErrorMsg += "<li>Enquiry is required.</li>";
                }                 
             if(strErrorMsg != "")
                {
                    strErrorMsg = "Please correct the following errors and resubmit the form:-" + strErrorMsg;
                    document.getElementById(strControlName+"lblError").innerHTML = strErrorMsg;
                    return false;
                } 
            return true;     
        }
        
        
        function ClearForm()
        {
            document.getElementById(strControlName+"txtName").value = "";
            document.getElementById(strControlName+"txtEmail").value = "";
            document.getElementById(strControlName+"txtAddress").value = "";
            document.getElementById(strControlName+"txtComments").value = "";
            document.getElementById(strControlName+"txtPhone").value = "";
            document.getElementById(strControlName+"txtFax").value = "";
            document.getElementById(strControlName+"lblError").innerHTML = "";
            return false;   
        }
        
    function validEmail(field) 
        {
             if (field != null && field != "")
             {
                var a = field.lastIndexOf("@");
                var b = field.lastIndexOf(".");
                var c = field.indexOf(":");
                var d = field.indexOf("/");
                var e = field.substring(0,a);
                var f = e.indexOf("@");
                var g = field.substring(a+1,field.length);
                var h = g.indexOf("[");
                var i = g.indexOf("]");
                var j = g.indexOf("<");
                var k = g.indexOf(">");
                var l = field.substring(a+1,b);
                var m = field.substring(b+1,field.length);
                var n = field.substring(0,a);
                var o = 0;
                if (a > b) {o++};
                if (c != -1) {o++};
                if (d != -1) {o++};
                if (f != -1) {o++};
                if (h != -1) {o++};
                if (i != -1) {o++};
                if (j != -1) {o++};
                if (k != -1) {o++};
                if (l.length < 3) {o++};
                if (m.length < 2) {o++};
                if (n.length < 1) {o++};
                if (o == 0) {
                    return true;
                }
                else {
                    return false;
                }
            }
        } 
        
        
    function isBlank(fieldValue)
        {
            if(!fieldValue) return true;
            var len = fieldValue.length;
            var i;
            for(i=0;i<len;++i)
            {
	            if(fieldValue.charAt(i) == '\r') continue;
	            if(fieldValue.charAt(i) == '\n') continue;
	            if(fieldValue.charAt(i) != " ") return false;
            }
            return true;
        }