how to change a texture scale of a model in runtime?

i want change texture size of a model to smaller and repeat it in runtime. i want change skin[s] size.

help please

col = tex2D(SAMPLER, Tex*scale); ?

is shader?

Take this shader:
http://www.conitec.net/shaders/shader_work2.htm
add
float4 vecSkill41;
and in your pixel shader
float4 Color = tex2D(ColorMapSampler, InTex*vecSkill41.x);

Now you can control the scale of your texture with entity.skill41 (set skill with floatv()).

tanx. its work.
but when sknill41 > 1 or < 0 , the texture is damaged.
i want try to pressed and I repeat the texture.

// Color map sampler
sampler ColorMapSampler = sampler_state
{
Texture = <entSkin1>;
AddressU = Wrap;
AddressV = Wrap;
};

dear Hummel , can you write all of the your fx file?
my HLSL is not good.

You don't need fx file. Your texture is damaged, because "AddressU & AddressV=clamp". it must be wrap. So copy the hummel's post and replace it with your code.

Sorry for slightly off-topic, but can anyone give me a link to
a list of the various sampler states in HLSL?
And most importantly, what their DEFAULT values are?