I have tried this
<head id="Head1" runat="server">
<title>Back Office</title>
<link href="~/Styles/MasterPage.css" rel="stylesheet" type="text/css" />
<link href="Styles/custom-theme/jquery-ui-1.8.12.custom.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="<%= Page.ResolveClientUrl("~/scripts/jquery-1.5.1.min.js") %>"></script>
<asp:ContentPlaceHolder ID="HeadContent" runat="server">
</asp:ContentPlaceHolder>
</head>
The error message is

I think too much, it is just find using this sorry
It seems that, you are trying to add controls to page dynamically. In this case, you can use the below code
var control = new HtmlGenericControl("script") ;
control.Attributes.Add("type", "text/javascript");
control.Attributes.Add("src", Page.ResolveClientUrl("~/scripts/jquery-1.5.1.min.js"));
//CDN will be best while hosting the application
//control.Attributes.Add("src", "http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js");
this.Page.Header.Controls.Add(control);
Try using DataBinding with ResolveUrl
<script src="<%# ResolveUrl("~/Scripts/jquery-1.5.1.min.js") %>"
type="text/javascript"></script>
Then in your code behind call the Header's Databind
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
Page.Header.DataBind();
}
If you start getting errors regarding the ViewState you may need to disable it on the header.
<head runat="server" enableviewstate="false">
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