jQuery Selecting ID with forward slash

My code below does not work if the ID has a forward slash in the name. I have read you have to escape special characters with a double backslash, but my data comes from a database. Is there a formula that adds a double back slash if a forward slash is found?

var sup_code = $(this).attr('id');

// Start of Price Override Change
		$('.ListResults').on('click','.Change_Price', function(event) {
		event.preventDefault();
				
				var sup_code = $(this).attr('id');
				var current_cost = $(this).text().replace('£', '');
				
				$.post("ink_override_script.php", {
									cust_id: $('#cust_id').text(),
									supplier_code: sup_code,
									price_override: $(this).attr('rel')
        						}, function(data) {  
									$("#" + sup_code).hide();
									$("#Price_Editing-" + sup_code).html(data).show();
									$('.loadingDiv').hide();
									
									$('.ListResults').on('click','.SavePrice', function(event) { 
										if( $('.price_overrider-' + sup_code).val() != current_cost )
											{
												if( $("#" + sup_code).hasClass('price_override')) {
													
													$.post("ink_override_update_script.php", {
														cust_id: $('#cust_id').text(),
														supplier_code: sup_code,
														price_override_update: $('.price_overrider-' + sup_code).val(),
        											}, function(data) {  
														$('.loadingDiv').hide();
														$("#" + sup_code).text($('.price_overrider-' + sup_code).val()).show().addClass('price_override');
														var amount = $("#" + sup_code).text();
														$("#" + sup_code).text("£" + amount);
														$("#" + sup_code).attr('rel', amount);
														$("#Price_Editing-" + sup_code).hide();
														$('.price_overrider-' + sup_code).toggleClass( 'disabled' );
                            						});
													
												} else {
													
												$.post("ink_override_insert_script.php", {
													cust_id: $('#cust_id').text(),
													supplier_code: sup_code,
													price_override_update: $('.price_overrider-' + sup_code).val(),
        										}, function(data) {  
													$('.loadingDiv').hide();
													$("#" + sup_code).text($('.price_overrider-' + sup_code).val()).show().addClass('price_override');
													var amount = $("#" + sup_code).text();
													$("#" + sup_code).text("£" + amount);
													$("#" + sup_code).attr('rel', amount);
													$("#Price_Editing-" + sup_code).hide();
													$('.price_overrider-' + sup_code).toggleClass( 'disabled' );
                            					});
												
												}
												
											} else {
												$('.loadingDiv').hide();
												$("#" + sup_code).show();
												$("#Price_Editing-" + sup_code).hide();
											}
											
		 							});  
		
                            	});
	
		});
		// End of Price Override Change

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