I need to a javascript or another web popup box that works like a windows message box

I need a way to display popup box much like a windows message box that when a submit button is clicked it checks if a textbox contians certian words. If the textboxes does then a popup box comes up asking the user if they want to continue the operation or return back to the webpage.
Below is the code that I have worked out if I could use a windows message box, I know that you can't use a windows box in a web applicaion. However, below is how I would like for the popup box to work.
if (txtWebinarCourseName.Text.Contains("Servicing") || txtWebinarCourseName.Text.Contains("Your Book") || txtWebinarCourseName.Text.Contains("Advanced")
                                 || txtWebinarCourseName.Text.Contains("Billing") || txtWebinarCourseName.Text.Contains("EA/EFS") || txtWebinarCourseName.Text.Contains("The EA/EFS Partnership")
                                 || txtWebinarCourseName.Text.Contains("Compliance") || txtWebinarCourseName.Text.Contains("IS Appeals")
                                 || txtWebinarCourseName.Text.Contains("Who to Contact") || txtWebinarCourseName.Text.Contains("My Work Items")
                                 || txtWebinarCourseName.Text.Contains("Quote-Requote Process") || txtWebinarCourseName.Text.Contains("New Customer")
                                 || txtWebinarCourseName.Text.Contains("On-Boarding") || txtWebinarCourseName.Text.Contains("Allstate Claims")
                                 || txtWebinarCourseName.Text.Contains("Property Re-inspection Initiative ") || txtWebinarCourseName.Text.Contains("Reports and Compensation")
                                 || txtWebinarCourseName.Text.Contains("Know Your Numbers") || txtWebinarCourseName.Text.Contains("Risk Management")
                                 || txtWebinarCourseName.Text.Contains("West Central"))
                            {
                                string messageBoxText = "The course name you entered is simular to an exsisting course: " + txtWebinarCourseName.Text + "Do you want to continue?";
                                string caption = "Verify Course Name";
                                MessageBoxButtons button = MessageBoxButtons.YesNo;
                                MessageBoxIcon icon = MessageBoxIcon.Question;

                                // Display message box
                                DialogResult result = MessageBox.Show(messageBoxText, caption, button, icon);

                                // Process message box results 
                                switch (result)
                                {
                                    case DialogResult.Yes:
                                        // User pressed Yes button 
                                        SubmitWebinar(false);
                                        break;
                                    case DialogResult.No:
                                        // User pressed No button 
                                        break;
                                }

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newjeep19Asked:
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leakim971PluritechnicianCommented:
basically you block the execution of any code in a page using a message box (alert, confirm,prompt)
all block the execution of the code until the user clock ok or cancel if available

the other box available you can find don't work like that, they use a callback function executed when the user click on a button.

so we have :

 // Display message box
                                DialogResult result = MessageBox.Show(messageBoxText, caption, button, icon, callbackFunction);

with somewhere you declare :
function callbackFunction(result) {
                                // Process message box results 
                                switch (result)
                                {
                                    case DialogResult.Yes:
                                        // User pressed Yes button 
                                        SubmitWebinar(false);
                                        break;
                                    case DialogResult.No:
                                        // User pressed No button 
                                        break;
                                }
}

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